Mini-ISO Relays

Uh, Relays?

The Basic Car Audio Electronics site has a very good explanation of how relays work.

Mini-ISO

30-amp Mini-ISO relay with pre-wired single and double sockets

The most commonly found aftermarket relays are Mini-ISO relays, typically referred to as "Bosch-type". There are many brands available, including Bosch, Hella, and whatever no-name brand your local Kragen stocks. To my knowledge, none of the available relays are fully sealed. The bottom panels appear solid, but there is no epoxy applied where the terminals enter the body, so ultimately there is a path for moisture. If you want a 100% sealed relay, look at these.

30-amp relays typicall come with a mounting tab. Personally, I would much prefer that the socket be mounted, and the relay itself be easily changeable.

Bosch

From Chief Enterprise:

Picture	Part Number	Form	Load Current	Suppression	Enclosure
File:BoschMiniISORelay0322002150.jpg	0 322 002 150	SPST, Dual contacts	100 A - 100,000 cycles	No	Standard cover w/bracket
File:BoschMiniISORelay0322002156.jpg	0 322 002 156	SPST	75 A - 100,000 cycles	Parallel and series diodes	Standard cover w/bracket
File:BoschMiniISORelay0322019103.jpg	0 322 019 103	SPST	50 A - 150,000 cycles	Resistor	Standard cover
File:BoschMiniISORelay0322019110.jpg	0 322 019 110	SPST	50 A - 150,000 cycles	Resistor	Standard cover w/bracket
File:BoschMiniISORelay0322019150.jpg	0 322 019 150	SPST	40 A - 200,000 cycles - 23 deg C	No	Standard cover w/bracket
File:BoschMiniISORelay0322019151.jpg	0 322 019 151	SPST	40 A - 200,000 cycles	No	Standard cover
File:BoschMiniISORelay0322019155.jpg	0 322 019 155	SPST	40 A - 200,000 cycles	Diode	Standard cover w/bracket
File:BoschMiniISORelay0322201107.jpg	0 322 201 107	SPDT	30 A - 100,000 cycles	Resistor	Standard cover
File:BoschMiniISORelay0322209137.jpg	0 322 209 137	SPDT	50 A - 150,000 cycles	Resistor	Standard cover
File:BoschMiniISORelay0322209138.jpg	0 322 209 138	SPDT	50 A - 150,000 cycles	Resistor	Standard cover w/bracket
File:BoschMiniISORelay0322209150.jpg	0 322 209 150	SPDT	40 A - 200,000 cycles	No	Standard cover w/bracket
File:BoschMiniISORelay0322209151.jpg	0 322 209 151	SPDT	40 A - 200,000 cycles	No	Standard cover
File:BoschMiniISORelay0322209159.jpg	0 322 209 159	SPDT	40 A - 200,000 cycles	Resistor	Standard cover
File:BoschMiniISORelay0322209161.jpg	0 322 209 161	SPDT	40 A - 200,000 cycles	Resistor	Standard cover w/bracket
File:BoschMiniISORelay0322209164.jpg	0 322 209 164	SPDT	30 A - 100,000 cycles	No	Standard cover
File:BoschMiniISORelay0322209168.jpg	0 322 209 168	SPDT	30 A - 250,000 cycles	No	Standard cover

Sockets

Bosch Mini-ISO relay socket without tab p/n 3-334-485-007

Bosch Mini-ISO relay socket with tab p/n 3-334-485-008

Relay sockets make it much easier to change out a bad relay. Without a socket, you'll have to remember which wire went to which terminal pin. Relays are generally extremely reliable, but if you're trying to track down an electrical gremlin the last thing you want to do is fiddle with such a headache.

Tessco sells supposedly genuine Bosch sockets (note that their pictures do not match mine, but their part numbers do):

• $0.80 for sockets with mounting tab (p/n 465687, Bosch p/n 3-334-485-008).
• $0.45 for sockets without mounting tab (p/n 464695, Bosch p/n 3-334-485-007).

Neither of these come with the metal terminal inserts, those are sold separately (p/n 91211, Bosch p/n 42238-2/100, 100 pack, $22.25!). Alternatively, pre-wired sockets (Wireless Solutions p/n RH1) are available for $2.10, but you can't get these with a mounting tab.

Hella makes female terminals ("FEMALE DISCONNECTS with CATCH"), p/n 87272:

• $14.69 from Summit Racing

Hella also makes a relay socket with mounting tab, p/n 87122 (presumably without terminals):

• $2.39 from Summit Racing.
• $1.22 from REM Electronics.

This page shows two Bosch Mini-ISO relay sockets. Part number 3 334 485 007 (no mounting tab) and 3 334 485 008 (with mounting tab).

WayTek sells the following:

• Bosch 3 334 485 008 relay socket with tab (WayTek p/n 75280) for $0.73 each, minimum seven.
• Bosch 3 334 485 007 relay socket without tab (WayTek p/n 75281) for $0.27 each, minimum 19.
• Each socket requires four or five pins (WayTek p/n 31073) for $0.14 each, minimum 35.