There are
three versions of the DIN relay:
1) Four-pin, SPST (Single Pole, Single Throw.) A simple "ON/OFF" relay. Usually numbered 30/85/86/87
2) Five-pin, SPDT (Single Pole, Double Throw.) Usually used as an "ON/OFF" relay, but can be used to switch to "one of two" circuits, powering one
or the other. Usually numbered 30/85/86/87/87a
3) Five-pin, DPST (Double Pole, Single Throw.) Used to power two circuits "ON/OFF"
at the same time. Usually numbered 30/85/86/87/87
Of the three, type (2) is the most common and easiest to find. Any of three can be used as a simple "ON/OFF" relay, but type (2) and type (3) may not be substituted one for the other.
DIN/ISO relays - the small 1" cubes - are typically rated for 30A per circuit - meaning that type (1) and type (2) can be used to supply a single 30A circuit, while type (3) - supposedly - can be used to feed
two circuits at 30A. I've been loath to try it until I can set up controlled circumstances for evaluation. I've no trouble, however, using a DPST relay (type (3)) to feed 15A per circuit, and it can probably do 20A safely - I've just not tried it.
The DIN relay specification calls for the schematic of the relay to be stamped or inked on the side of the relay case - and the terminals on the bottom to be numbered. However, if the schematic is inked on the side of the cube, it can wear off.
Typical uses for the terminals:
Pin 30 - Mains Power Feed for the circuit
Pin 85 - "Trigger" lead for relay coil
Pin 86 - Earth for relay coil (direct ground will serve.)
Pin 87 - NO (Normally Open) accessory lead (OFF until the relay is turned triggered)
Pin 87a - NC (Normally Closed) accessory lead (ON until the relay is triggered.)
beakie said:
not really understanding what your saying about the pins
your feeding one pin and your getting lights?
Either way, I am pretty sure there are 2 dif relays, one where both 87 and 87a are live at the same time, and one where they are live seperately (when relay is fed 87 is open, 87a is closed)
If you have any other relays around it would be simple to toss one in, otherwise they are pretty cheap so picking one up wouldn't hurt the bank.
Only problem I ever had with the wiring upgrade was my daytime running lights (Canadian option).