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Redarc CR1224L latching chopper relay. Compact sealed black thermoplastic housing with a standard 5-pin ISO relay base. Two latched outputs (pins 87 and 87a) that alternate on each momentary push-button pulse into pin 86. Made in Lonsdale, South AustraliaRedarc CR1224L chopper relay, side profile on a neutral background. Standard 5-pin automotive relay body with Redarc branding on the top face. 81 by 31 by 30mm with any-angle mounting

Redarc

Latching Chopper Relay — CR1224L 10A 12V/24V

CR1224L

2-year Redarc warranty · 12V and 24V DC switching from a single momentary push-button, 10A per output, two latched outputs that alternate on each press, standard 5-pin ISO base, mounts at any angle, made in Lonsdale, South Australia.

10A per output
12V or 24V DC
5-pin latching

$219.00

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Universal fitmentDual-output latching chopper relay for 12V or 24V DC switching from a single momentary push-button

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A latching relay from Redarc that toggles between two outputs on each press of a single momentary push-button. Press once to send power out of pin 87; press again to drop 87 and energise pin 87a. Fits dash-mounted switch panels running fog lights, rear demisters, interior lamps, driving-light bank changeovers, or any accessory that needs on and off control from a single momentary switch rather than a latching toggle.

The body is 81 by 31mm and 30mm tall in a sealed thermoplastic housing with a standard 5-pin ISO relay footprint, so it drops into any mini-relay base or inline socket. Pins 85 and 86 take the coil feed and trigger input, pin 30 is the battery feed, and pins 87 and 87a are the two latched outputs. Mount at any angle without affecting operation. Made in Lonsdale, South Australia by Redarc Electronics.

Hold each output under 10A continuous. For fog lights, demisters or any inductive accessory above that limit, drive a slave relay from pin 87 and switch the big load through its contacts. Fuse the main feed at the battery to a value matched to the downstream circuit.

Pairs with

Mini Relay Base — 4 & 5 Pin ISO Stackable

$6.00

  • Latching Operation — holds each output on until the next push
  • Dual Outputs — alternates between pin 87 and 87a
  • 12V and 24V Compatible — one unit covers both DC systems
  • 10A per Output — drives fog lights, demisters and lamps
  • 5-Pin ISO Base — drops into any mini-relay socket
  • Any-Angle Mount — orientation does not affect operation
  • State Retention — holds last position when power drops
  • Made in Australia — built by Redarc in Lonsdale, South Australia

Electrical

Voltage: 12V or 24V DC

Current: 10A per output

Config: Two-output latch

Trigger: Momentary +ve

Operating temp: -40 to +85°C

Physical

Dimensions: 81 × 31 × 30mm

Terminals: 5-pin ISO

Weight: 0.09 kg

Housing: Sealed thermoplastic

Made in: Lonsdale, Australia

Length: 81mm

Width: 31mm

Height: 30mm

Weight: 0.09kg

Dual-output latching chopper relay for 12V or 24V DC switching from a single momentary push-button
12V DC vehicles — 4WDs, caravans, campers, trailers, boats
24V DC trucks, buses and heavy-equipment auxiliary circuits
Any accessory under 10A continuous (fog lights, demisters, interior lamps, water pumps)
Not for loads above 10A per output — drive a slave relay from pin 87 for high-current circuits
Not for mains voltage — DC only, maximum 32V DC

Q: What is a latching chopper relay (also called a flip-flop relay)?
A relay with two outputs that swap each time its trigger input is pulsed. Press a momentary push-button and one output turns on; press again and that output drops while the other turns on. The relay stays in its last state between presses, so a single momentary switch gives you on and off control over two circuits without needing a maintained toggle.

Q: How does the two-output alternation work?
Pins 87 and 87a are the two outputs. On power-up, 87 is active and 87a is off. The first momentary pulse on pin 86 drops 87 and energises 87a. The next pulse swaps them back. One push-button, two circuits, one output at a time.

Q: Does it stay in its last state if the battery is disconnected?
Yes. The latch holds its position without any coil current, so a disconnected or flat battery does not reset it. When power comes back, the output that was active before the disconnect is the output that comes on.

Q: Can I use it with LED lights?
Yes, so long as the combined LED current on each output stays under 10A. A typical set of auxiliary LED driving lights draws 4-8A at 12V, so a single pair runs comfortably off one output.

Q: What size cable and fuse should I run?
For the pin 30 battery feed and each pin 87/87a output, use 2.5mm² cable at 12V (or 1.5mm² at 24V) for runs under about 3 metres, stepping up to 4mm² at 12V on longer runs. Fuse the battery feed at 15A within 300mm of the battery, matched to the heaviest downstream circuit the relay drives.

Q: Can it drive a load bigger than 10A with a slave relay?
Yes. Wire pin 87 (or 87a) to the coil input of a standard 30A or 40A automotive relay and run the big load through that slave relay's contacts. The chopper relay then only ever switches the slave relay's coil current (around 0.15A) regardless of how heavy the final load is.

Q: Will one unit work in both 12V and 24V vehicles?
Yes. The CR1224L accepts anything between 12V and 24V DC on pin 30 and triggers off the same voltage on pin 86, so it drops straight into a 12V 4WD or a 24V truck without any changeover.

Q: What size push-button switch do I need?
Any momentary normally-open push-button or dash switch rated for the system voltage. The trigger input on pin 86 only draws a few milliamps for the moment the button is pressed, so a 1A or 2A rated momentary switch is more than enough.

Q: Can I mount the relay upside down or on its side?
Yes. Redarc rates the CR1224L for any-angle mounting with no effect on performance. Mount it with the pins down for best water run-off, but orientation itself does not matter electrically.

Q: What is the difference between this and the momentary CR1224 chopper relay?
The CR1224L (this product) is latching: each push toggles between the two outputs and holds. The non-L CR1224 is momentary: it energises an output only while the trigger is held. Pick the L for push-button on/off control, the non-L for a horn-style press-and-hold circuit.

Q: Does the relay itself need its own fuse on the battery feed?
Yes. Protect the pin 30 battery feed with an inline fuse within 300mm of the battery, sized to the heaviest downstream circuit (typically 15A for a 10A continuous relay with surge headroom). The fuse protects both the cable and the relay contacts from a downstream short.

Q: What warranty does Redarc provide on the CR1224L?
2 years against manufacturing defects, direct from Redarc. The warranty covers coil, contact and housing integrity under normal 12V or 24V DC use; loads above 10A continuous, reversed polarity on pin 30, and voltages above 32V DC are not covered.

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