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Mini-ISO Relays

From GummyCarbs

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
BoschMiniISORelay0332002150.jpg 0 332 002 150 SPST, Dual contacts 100 A - 100,000 cycles No Standard cover w/bracket
BoschMiniISORelay0332002156.jpg 0 332 002 156 SPST 75 A - 100,000 cycles Parallel and series diodes Standard cover w/bracket
BoschMiniISORelay0332019103.jpg 0 332 019 103 SPST 50 A - 150,000 cycles Resistor Standard cover
BoschMiniISORelay0332019110.jpg 0 332 019 110 SPST 50 A - 150,000 cycles Resistor Standard cover w/bracket
BoschMiniISORelay0332019150.jpg 0 332 019 150 SPST 40 A - 200,000 cycles - 23 deg C No Standard cover w/bracket
BoschMiniISORelay0332019151.jpg 0 332 019 151 SPST 40 A - 200,000 cycles No Standard cover
BoschMiniISORelay0332019155.jpg 0 332 019 155 SPST 40 A - 200,000 cycles Diode Standard cover w/bracket
BoschMiniISORelay0332201107.jpg 0 332 201 107 SPDT 30 A - 100,000 cycles Resistor Standard cover
BoschMiniISORelay0332209137.jpg 0 332 209 137 SPDT 50 A - 150,000 cycles Resistor Standard cover
BoschMiniISORelay0332209138.jpg 0 332 209 138 SPDT 50 A - 150,000 cycles Resistor Standard cover w/bracket
BoschMiniISORelay0332209150.jpg 0 332 209 150 SPDT 40 A - 200,000 cycles No Standard cover w/bracket
BoschMiniISORelay0332209151.jpg 0 332 209 151 SPDT 40 A - 200,000 cycles No Standard cover
BoschMiniISORelay0332209159.jpg 0 332 209 159 SPDT 40 A - 200,000 cycles Resistor Standard cover
BoschMiniISORelay0332209161.jpg 0 332 209 161 SPDT 40 A - 200,000 cycles Resistor Standard cover w/bracket
BoschMiniISORelay0332209164.jpg 0 332 209 164 SPDT 30 A - 100,000 cycles No Standard cover
BoschMiniISORelay0332209168.jpg 0 332 209 168 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):

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:

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

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: