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My search for micro-relays began with some instructions for [http://motorcycleinfo.calsci.com/ST1300_d.html converting an ST1300 to an electric windshield].  It has a [http://motorcycleinfo.calsci.com/ST1300/ElectricShield4.jpg picture] of the two types of Micro-ISO relays, as well as the seemingly identical "suspension" mounting sleeves.
[[Image:MicroISO.jpg|thumb|An Omron Micro-ISO relay, as available through Honda]]
[[Image:MicroISOandBosch.jpg|thumb|The same Micro-ISO relay next to a common Bosch relay]]
 
 
=== Basics ===
 
My search for Micro-ISO relays began with some instructions for [http://motorcycleinfo.calsci.com/ST1300_d.html converting an ST1300 to an electric windshield].  It has a [http://motorcycleinfo.calsci.com/ST1300/ElectricShield4.jpg picture] of the two types of Micro-ISO relays, as well as the rubber "suspension" sleeves intended to isolate the relays from vibration.
 
There are two common types of relays, SPST (Single Pole, Single Throw) and SPDT (Single Pole, Double Throw).  SPST relays can only close a circuit.  SPDT relay close one circuit at rest, and a second circuit when active.  Effectively, the only difference is an extra output leg on the SPDT relays, so unless you're worried about confusing yourself, you may as well use SPDT relays and ignore the extra output leg when it's unneeded.
 
=== Sourcing from Honda ===


[http://www.ronayers.com Ron Ayers] shows the two-way Micro-ISO relays on their [http://www.ronayers.com/fiche/200_0418/cowl_stay/cowl_stay.cfm ST1300 cowl microfiche].  It's item [http://www.ronayers.com/browseparts.cfm?searchstring=38502-MCS-G00 five], part number 38502-MCS-G00, "RELAY (MICRO ISO 5P)".
[http://www.ronayers.com Ron Ayers] shows the two-way Micro-ISO relays on their [http://www.ronayers.com/fiche/200_0418/cowl_stay/cowl_stay.cfm ST1300 cowl microfiche].  It's item [http://www.ronayers.com/browseparts.cfm?searchstring=38502-MCS-G00 five], part number 38502-MCS-G00, "RELAY (MICRO ISO 5P)".
Line 5: Line 15:
For reference, his same relay is available from [http://www.cycle-parts.com/cart.asp?Action=searchparts&SKUSearch=38502-MCS-G00 Cycle-Parts] for $6.46.  Ron Ayers, by comparison, is $6.15.
For reference, his same relay is available from [http://www.cycle-parts.com/cart.asp?Action=searchparts&SKUSearch=38502-MCS-G00 Cycle-Parts] for $6.46.  Ron Ayers, by comparison, is $6.15.


Also on this [http://www.ronayers.com/fiche/200_0418/cowl_stay/cowl_stay.cfm same microfiche page] is item [http://www.ronayers.com/browseparts.cfm?searchstring=38306-MCA-000 four], p/n 38306-MCA-000 "SUSPENSION", which is a sleeve intended to attach the relay to the cowl.  These "suspensions" also make excellent waterproofing housings for simple switches, such as you might use for accessories on your motorcycle.  Just cut a round hole in the end and fit it snugly around the switch body, and zip-tie the open end closely around the wires.  Don't buy this one, though, because...
A second, four-point relay is available on the [http://www.ronayers.com/fiche/200_0418/wire_harness_st1300/wire_harness_st1300.cfm ST1300 wire harness microfiche] as item [http://www.ronayers.com/browseparts.cfm?searchstring=38501-MCS-G00  eight].  Part number 38501-MCS-G00, "RELAY (MICRO ISO 4P)".  This is a four point relay, meaning that it can only close a single circuit, rather than switching between two circuits.  Since it's the same price, at $6.15, I can't see any reason not to buy the five-point relay!
 
=== Manufacturer ===
The Micro-ISO relays sold by Honda are made by [http://www.omron.com Omron].  The [http://www.ronayers.com/browseparts.cfm?searchstring=38502-MCS-G00 five-point relay] is Omron part number G8HN-1C4T-RH.  The final H indicates "high capacity".  The 4T- indicates sealed (unsealed is -2T).  -1A indicates SPST ("four-point"), while -1C indicates SPDT ("five-point").  As near as I can tell, the -R indicates a suppression resistor is used (where??).
 
Omron's [http://eu.omron.com/Images/en/165_19938.pdf GH8N-J Data Sheet] has the following specification charts.  The relevant information is in <b>bold</b>:
{| border=1 cellspacing=0 cellpadding=5
| colspan=2 align=center bgcolor=lightgrey | Part Number
| rowspan=2 align=center bgcolor=lightgrey | Contact Type
|-
| align=center bgcolor=lightgrey | Unsealed
| align=center bgcolor=lightgrey | Sealed
|-
| G8HN-1A2T-RJ/DJ (DC12V/DC24V)
| G8HN-1A4T-RJ/DJ (DC12V/DC24V)
| SPST Standard
|-
| G8HN-1C2T-RJ/DJ (DC12V/DC24V)
| G8HN-1C4T-RJ/DJ (DC12V/DC24V)
| SPDT Standard
|-
| G8HN-1A2T-RH/DH (DC12V)
| <b>G8HN-1A4T-RH/DH (DC12V)</b>
| SPST High capacity
|-
| G8HN-1C2T-RH/DH (DC12V)
| <b>G8HN-1C4T-RH/DH (DC12V)</b>
| SPDT High capacity
|}
 
 
{| border=1 cellspacing=0 cellpadding=5
| colspan=3 bgcolor=lightgrey | Arrangement
| SPST,SPDT
|-
| colspan=3 bgcolor=lightgrey | Contact material
|  Silver tin oxide (cadmium free)
|-
| rowspan=2 bgcolor=lightgrey | Contact voltage drop
| colspan=2 bgcolor=lightgrey | Standard
| Less than 200 mV at 20A
|-
| colspan=2 bgcolor=lightgrey | High capacity
| Less than 200 mV at 35A
|-
| rowspan=3 bgcolor=lightgrey | Max. Switching Current
| rowspan=2 bgcolor=lightgrey | Standard
| bgcolor=lightgrey | 12VDC
| N.O. side: Inrush 100A, Steady 20A<br>N.C. side: Inrush 50A, Steady 10A
|-
| bgcolor=lightgrey | 24VDC
| N.O. side: Inrush 30A, Steady 10A<br>N.C. side: Inrush 15A, Steady  5A
|-
| bgcolor=lightgrey | High capacity
| bgcolor=lightgrey | 12VDC
| <b>N.O. side : Inrush 120A, Steady 35A<br>N.C. side : Inrush  40A, Steady 20A</b>
|}
 
 
Incidentally, the G8HR line seems to be a high-capacity standard ISO relay, handling 70 amps.  It uses a pinout like a typical Bosch-type relay, except that the input leg is massive.
 
===Alternative Sources for Omron relays===
 
The [http://www.mouser.com Mouser] catalog, [http://www.mouser.com/catalog/625/1300.pdf page 1300] lists the G8HN-1C2T-R-DC12 relay for $4.38.  However, these are neither sealed (2T-) nor high-capacity (no final H), so don't use these.
 
===Alternative Manufacturers===
 
====Bosch====
The [http://www.airheads.org/content/view/159/49/ Airhead BMW group] says lists the following for Micro-ISO relays:<br>
BMW: 61 31 1 459 677<br>
Type: 12V; micro-relay<br>
Notes: "Load Shedding" Relay for all 'GS, 'R and 'MYS '91 on (30, 85, 86, 87 w/ 680ohm resistor 85-86)<br>
Bosch: 0 332 017 100*, 0 332 207 100*, 0 332 207 300*, 0 332 207 301*, 0 332 207 310*<br>
 
[http://www.chiefent.com Chief Enterprises] has an excellent [http://www.chiefent.com/products/products_relays.asp list of Bosch relays].  I stole the relevant information and put it here:
{| border=1 cellspacing=0 cellpadding=5
| align=center bgcolor=lightgrey | Part number
| align=center bgcolor=lightgrey | Voltage
| align=center bgcolor=lightgrey | Form
| align=center bgcolor=lightgrey | Load current
| align=center bgcolor=lightgrey | Suppression
| align=center bgcolor=lightgrey | Enclosure
|-
| [http://www.chiefent.com/products/product_details.asp?id=29 0 332 011 007]
| 12 V
| SPST
| 30 A - 100,000 cycles
| Resistor
| Standard cover
|-
| [http://www.chiefent.com/products/product_details.asp?id=23 0 332 017 300]
| 12 V
| SPST
| 20A - 300,000 cycles
| Resistor
| Standard cover
|-
| [http://www.chiefent.com/products/product_details.asp?id=24 0 332 017 302]
| 12 V
| SPST
| 20A - 300,000 cycles
| Resistor
| Standard cover w/bracket
|-
| [http://www.chiefent.com/products/product_details.asp?id=30 0 332 201 107]
| 12 V
| SPDT
| 30 A - 100,000 cycles
| Resistor
| Standard cover
|-
| [http://www.chiefent.com/products/product_details.asp?id=25 0 332 207 307]
| 12 V
| SPDT
| 20A - 300,000 cycles
| Resistor
| Standard cover
|-
| [http://www.chiefent.com/products/product_details.asp?id=26 0 332 207 310]
| 12 V
| SPDT
| 20A - 300,000 cycles
| Resistor
| Standard cover w/bracket
|}
 
[http://www.waytekwire.com Waytek Wire] lists:
{| border=1 cellspacing=0 cellpadding=5
| align=center bgcolor=lightgrey | Picture
| align=center bgcolor=lightgrey | Bosch p/n
| align=center bgcolor=lightgrey | Waytek p/n
| align=center bgcolor=lightgrey | Price
| align=center bgcolor=lightgrey | Minimum Qty
|-
| [[Image:BoschMicroISORelay0-332-017-302.GIF]]
| 0 332 017 302
| 75202
| $3.97
| 2
|-
| [[Image:BoschMicroISORelay0-332-207-307.GIF]]
| 0 332 207 307
| 75213
| $2.99
| 2
|-
| [[Image:BoschMicroISORelay0-332-011-007.GIF]]
| 0 332 011 007
| 75230
| $2.86
| 2
|-
| [[Image:BoschMicroISORelay0-332-201-107.GIF]]
| 0 332 201 107
| 75231
| $2.99
| 2
|}
 
====Hella====
According to [http://www.hella.com/produktion/HellaPortal/WebSite/Internet_usa/ProductsServices/On_Line_Catalogs/2004ConsBroch.pdf this Hella page] the 87416 is a 10/20 amp SPDT relay with resistor.  It lists the new part number as H41524021.
 
 
====Tyco Electronics====
Tyco Electronics also produces Micro ISO relays.  Their product data sheet is available [http://relays.tycoelectronics.com/datasheets/074-VFM.pdf here].  They list two useful part numbers:
{| border=1 cellspacing=0 cellpadding=5
| align=center bgcolor=lightgrey | Relay Part No
| align=center bgcolor=lightgrey | Tyco order No
| align=center bgcolor=lightgrey | Contact arrangement
| align=center bgcolor=lightgrey | Contact material
| align=center bgcolor=lightgrey | Enclosure
| align=center bgcolor=lightgrey | Terminals
|-
| VFMA-21F41-S01
| 0-1432503-1
| 1 Form A <b>(SPST)</b>
| AgSnO2
| Dust cover, <b>Sealed</b>
| <b>Quick connect</b>
|-
| VFMA-25F41-S01
| 0-1432506-1
| 1 Form C <b>(SPDT)</b>
| AgSnO2
| Dust cover, <b>Sealed</b>
| <b>Quick connect</b>
|}
 
It appears that "Form A" means SPST (can only switch on or off), while "Form C" means SPDT (can switch between two contacts).  According to [http://catalogue.e-sonic.com/cgi-bin/listinglookup?listing=I344K05 this page] the S01 indicates a resistor (680&Omega;) in parallel with the coil, which presumably is analogous the -R in the Omron part numbers.
 
====P&B====
[http://catalogue.e-sonic.com/cgi-bin/listinglookup?listing=I344K05 P&B] makes Micro-ISO relays.
 
====Zettler Automotive====
[http://zettlerauto.com/view.asp?pr=44 Zettler] also makes Micro-ISO relays (p/n AZ988).  Interestingly, it gives the following cross reference part numbers:
*Aromat: CM
*Bosch: 0 332
*Hella: 87416
*Omron: G8H
*Song Chuan: 871
*Tyco: VFM
 
====Panasonic====
Panasonic's Micro-ISO relay datasheet is available [http://pewa.panasonic.com/pcsd/product/auto/pdf_cat/cv.pdf here].
 
[http://www.digi-key.com Digi-Key] lists Panasonic Micro-ISO relays.  They're significantly cheaper than other relays I've found, but with zero on-hand at Digi-Key and a minimum order across-the-board of 50, this is probably not a suitable solution:
{| border=1 cellspacing=0 cellpadding=5
| align=center bgcolor=lightgrey | Digi-Key p/n
| align=center bgcolor=lightgrey | Mfr p/n
| align=center bgcolor=lightgrey | Description
| align=center bgcolor=lightgrey | Vendor
| align=center bgcolor=lightgrey | Unit Price
| align=center bgcolor=lightgrey | Min Qty
|-
| ACV11012-ND
| ACV11012
| RELAY AUTO 12VDC MICRO ISO PLUG
| Panasonic Electric Works
| 2.98000
| 50
|-
| ACV31012-ND
| ACV31012
| RELAY AUTO 12VDC MICRO ISO PLUG
| Panasonic Electric Works
| 2.90000
| 50
|-
| ACV31024-ND
| ACV31024
| RELAY AUTO 24VDC MICRO ISO PLUG
| Panasonic Electric Works
| 3.08000
| 50
|-
| ACV11024-ND
| ACV11024
| RELAY AUTO 24VDC MICRO ISO PLUG
| Panasonic Electric Works
| 3.14000
| 50
|}
 
=== Sockets ===
 
[[Image:BoschMicroISORelaySocketWithTab3-334-485-045.jpg|thumb|Bosch Micro-ISO relay socket with tab p/n 3-334-485-045]]
 
[[Image:BoschMicroISORelaySocketWithoutTab3-334-485-046.jpg|thumb|Bosch Micro-ISO relay socket without tab p/n 3-334-485-046]]
 
[http://www.chiefent.com Chief Enterprises] has [http://www.chiefent.com/products/products_relay_accessories.asp a catalog page with very nice pictures of Bosch relay sockets], including Micro-ISO sockets:
* Bosch part number 3 334 485 045 with mounting tab.
* Bosch part number 3 334 485 046 without mounting tab.
 
According to [http://order.waytekwire.com/IMAGES/M37/catalog/218_053.pdf this Waytek page] these Micro-ISO sockets require three [http://order.waytekwire.com/CGI-BIN/LANSAWEB?WEBEVENT+L0B6F10351DF787000C60012+M37+ENG 30073] (3/16" 20-16GA) and two [http://order.waytekwire.com/CGI-BIN/LANSAWEB?WEBEVENT+L0B6F1031120707003640012+M37+ENG 31073] (1/4" 14-16GA) female terminal pins.


There is another, seemingly identical relay suspension available.  But it's nearly <b>half the price</b>!
WayTek sells
*[http://www.ronayers.com/browseparts.cfm?searchstring=38306-MCA-000 38306-MCA-000] $6.57
* Bosch 3 334 485 045 (Waytek p/n 75290) for [http://order.waytekwire.com/CGI-BIN/LANSAWEB?WEBEVENT+L0B6F10301EC70700F900012+M37+ENG $0.65 each, minimum quantity eight].
*[http://www.ronayers.com/browseparts.cfm?searchstring=38506-MCS-G00 38506-MCS-G00] $3.27


This second, cheaper relay suspension appears on the [http://www.ronayers.com/fiche/200_0418/wire_harness_st1300/wire_harness_st1300.cfm ST1300 wire harness microfiche] as item nine.  Also shown is item [http://www.ronayers.com/browseparts.cfm?searchstring=38501-MCS-G00 eight], 38501-MCS-G00 "RELAY (MICRO ISO 4P)".  This is a four point relay, meaning that it can only close a single circuit, it cannot switch between two circuits.  Since it's the same price, at $6.15, I can't see any reason not to buy the five-point relay!
[http://www.electronicsurplus.com/ccp68342-empty-automotive-relay-housing-w--no-terminals-3-334-485-045-139018.htm Electronic Surplus Inc] lists the Bosch relay with tab (3 334 485 045) for $5.

Latest revision as of 04:52, 25 May 2006

An Omron Micro-ISO relay, as available through Honda
The same Micro-ISO relay next to a common Bosch relay


Basics

My search for Micro-ISO relays began with some instructions for converting an ST1300 to an electric windshield. It has a picture of the two types of Micro-ISO relays, as well as the rubber "suspension" sleeves intended to isolate the relays from vibration.

There are two common types of relays, SPST (Single Pole, Single Throw) and SPDT (Single Pole, Double Throw). SPST relays can only close a circuit. SPDT relay close one circuit at rest, and a second circuit when active. Effectively, the only difference is an extra output leg on the SPDT relays, so unless you're worried about confusing yourself, you may as well use SPDT relays and ignore the extra output leg when it's unneeded.

Sourcing from Honda

Ron Ayers shows the two-way Micro-ISO relays on their ST1300 cowl microfiche. It's item five, part number 38502-MCS-G00, "RELAY (MICRO ISO 5P)".

For reference, his same relay is available from Cycle-Parts for $6.46. Ron Ayers, by comparison, is $6.15.

A second, four-point relay is available on the ST1300 wire harness microfiche as item eight. Part number 38501-MCS-G00, "RELAY (MICRO ISO 4P)". This is a four point relay, meaning that it can only close a single circuit, rather than switching between two circuits. Since it's the same price, at $6.15, I can't see any reason not to buy the five-point relay!

Manufacturer

The Micro-ISO relays sold by Honda are made by Omron. The five-point relay is Omron part number G8HN-1C4T-RH. The final H indicates "high capacity". The 4T- indicates sealed (unsealed is -2T). -1A indicates SPST ("four-point"), while -1C indicates SPDT ("five-point"). As near as I can tell, the -R indicates a suppression resistor is used (where??).

Omron's GH8N-J Data Sheet has the following specification charts. The relevant information is in bold:

Part Number Contact Type
Unsealed Sealed
G8HN-1A2T-RJ/DJ (DC12V/DC24V) G8HN-1A4T-RJ/DJ (DC12V/DC24V) SPST Standard
G8HN-1C2T-RJ/DJ (DC12V/DC24V) G8HN-1C4T-RJ/DJ (DC12V/DC24V) SPDT Standard
G8HN-1A2T-RH/DH (DC12V) G8HN-1A4T-RH/DH (DC12V) SPST High capacity
G8HN-1C2T-RH/DH (DC12V) G8HN-1C4T-RH/DH (DC12V) SPDT High capacity


Arrangement SPST,SPDT
Contact material Silver tin oxide (cadmium free)
Contact voltage drop Standard Less than 200 mV at 20A
High capacity Less than 200 mV at 35A
Max. Switching Current Standard 12VDC N.O. side: Inrush 100A, Steady 20A
N.C. side: Inrush 50A, Steady 10A
24VDC N.O. side: Inrush 30A, Steady 10A
N.C. side: Inrush 15A, Steady 5A
High capacity 12VDC N.O. side : Inrush 120A, Steady 35A
N.C. side : Inrush 40A, Steady 20A


Incidentally, the G8HR line seems to be a high-capacity standard ISO relay, handling 70 amps. It uses a pinout like a typical Bosch-type relay, except that the input leg is massive.

Alternative Sources for Omron relays

The Mouser catalog, page 1300 lists the G8HN-1C2T-R-DC12 relay for $4.38. However, these are neither sealed (2T-) nor high-capacity (no final H), so don't use these.

Alternative Manufacturers

Bosch

The Airhead BMW group says lists the following for Micro-ISO relays:
BMW: 61 31 1 459 677
Type: 12V; micro-relay
Notes: "Load Shedding" Relay for all 'GS, 'R and 'MYS '91 on (30, 85, 86, 87 w/ 680ohm resistor 85-86)
Bosch: 0 332 017 100*, 0 332 207 100*, 0 332 207 300*, 0 332 207 301*, 0 332 207 310*

Chief Enterprises has an excellent list of Bosch relays. I stole the relevant information and put it here:

Part number Voltage Form Load current Suppression Enclosure
0 332 011 007 12 V SPST 30 A - 100,000 cycles Resistor Standard cover
0 332 017 300 12 V SPST 20A - 300,000 cycles Resistor Standard cover
0 332 017 302 12 V SPST 20A - 300,000 cycles Resistor Standard cover w/bracket
0 332 201 107 12 V SPDT 30 A - 100,000 cycles Resistor Standard cover
0 332 207 307 12 V SPDT 20A - 300,000 cycles Resistor Standard cover
0 332 207 310 12 V SPDT 20A - 300,000 cycles Resistor Standard cover w/bracket

Waytek Wire lists:

Picture Bosch p/n Waytek p/n Price Minimum Qty
0 332 017 302 75202 $3.97 2
0 332 207 307 75213 $2.99 2
0 332 011 007 75230 $2.86 2
0 332 201 107 75231 $2.99 2

Hella

According to this Hella page the 87416 is a 10/20 amp SPDT relay with resistor. It lists the new part number as H41524021.


Tyco Electronics

Tyco Electronics also produces Micro ISO relays. Their product data sheet is available here. They list two useful part numbers:

Relay Part No Tyco order No Contact arrangement Contact material Enclosure Terminals
VFMA-21F41-S01 0-1432503-1 1 Form A (SPST) AgSnO2 Dust cover, Sealed Quick connect
VFMA-25F41-S01 0-1432506-1 1 Form C (SPDT) AgSnO2 Dust cover, Sealed Quick connect

It appears that "Form A" means SPST (can only switch on or off), while "Form C" means SPDT (can switch between two contacts). According to this page the S01 indicates a resistor (680Ω) in parallel with the coil, which presumably is analogous the -R in the Omron part numbers.

P&B

P&B makes Micro-ISO relays.

Zettler Automotive

Zettler also makes Micro-ISO relays (p/n AZ988). Interestingly, it gives the following cross reference part numbers:

  • Aromat: CM
  • Bosch: 0 332
  • Hella: 87416
  • Omron: G8H
  • Song Chuan: 871
  • Tyco: VFM

Panasonic

Panasonic's Micro-ISO relay datasheet is available here.

Digi-Key lists Panasonic Micro-ISO relays. They're significantly cheaper than other relays I've found, but with zero on-hand at Digi-Key and a minimum order across-the-board of 50, this is probably not a suitable solution:

Digi-Key p/n Mfr p/n Description Vendor Unit Price Min Qty
ACV11012-ND ACV11012 RELAY AUTO 12VDC MICRO ISO PLUG Panasonic Electric Works 2.98000 50
ACV31012-ND ACV31012 RELAY AUTO 12VDC MICRO ISO PLUG Panasonic Electric Works 2.90000 50
ACV31024-ND ACV31024 RELAY AUTO 24VDC MICRO ISO PLUG Panasonic Electric Works 3.08000 50
ACV11024-ND ACV11024 RELAY AUTO 24VDC MICRO ISO PLUG Panasonic Electric Works 3.14000 50

Sockets

Bosch Micro-ISO relay socket with tab p/n 3-334-485-045
Bosch Micro-ISO relay socket without tab p/n 3-334-485-046

Chief Enterprises has a catalog page with very nice pictures of Bosch relay sockets, including Micro-ISO sockets:

  • Bosch part number 3 334 485 045 with mounting tab.
  • Bosch part number 3 334 485 046 without mounting tab.

According to this Waytek page these Micro-ISO sockets require three 30073 (3/16" 20-16GA) and two 31073 (1/4" 14-16GA) female terminal pins.

WayTek sells

Electronic Surplus Inc lists the Bosch relay with tab (3 334 485 045) for $5.

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