This 12V 40A automotive relay is available in 4-pin and 5-pin configurations for switching vehicle electrical loads. The 4-pin version uses a normally open SPST contact, while the 5-pin version adds an 87a terminal for SPDT changeover operation.
Both versions use standard automotive relay terminals for integration into 12V electrical systems.
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When selecting a 12V 40A automotive relay, confirm the required contact configuration as well as the voltage, load current and switching logic of the circuit.
Select the relay according to the operating voltage, electrical load and required switching logic.
The 40A relay rating should not be interpreted as a requirement for every connected device to draw 40A.
| Item | Specification |
|---|---|
| Model | CZY-RE01 |
| Product Type | Automotive Relay |
| Coil Voltage | 12V DC |
| Current Rating | 40A |
| 4-Pin Variant | JD1912 |
| 4-Pin Contact Type | SPST / Normally Open |
| 4-Pin Terminals | 30 / 85 / 86 / 87 |
| 5-Pin Variant | JD1914 |
| 5-Pin Contact Type | SPDT / Changeover |
| 5-Pin Terminals | 30 / 85 / 86 / 87 / 87a |
| Mounting Type | Plug-In Automotive Relay |
A 12V 40A automotive relay is commonly used to control vehicle accessories where a relatively low-current switch or control signal needs to operate a higher-current load.
The 4-pin version of this 12V 40A automotive relay uses a simple normally open switching arrangement. Terminals 85 and 86 energize the relay coil, terminal 30 acts as the common power contact and terminal 87 provides the normally open switched output.
When the coil is energized, the internal contact closes and connects terminal 30 to terminal 87.
The 5-pin version of this 12V 40A automotive relay adds terminal 87a and uses a changeover contact arrangement. This allows one common terminal to switch between a normally closed and normally open output.
With the relay coil de-energized, terminal 30 is connected to 87a. When the coil is energized, the contact switches from 87a to 87.
The main difference is the switching function.
| Feature | 4 Pin Relay | 5 Pin Relay |
|---|---|---|
| Contact Type | SPST | SPDT |
| Normally Open Output | Yes | Yes |
| Normally Closed Output | No | Yes, terminal 87a |
| Typical Use | On / Off switching | Changeover switching |
A 4-pin relay is suitable when the circuit only needs to switch a load on when the relay is energized. A 5-pin relay is useful when the common contact needs to switch between two outputs.
Select the relay according to the operating voltage, electrical load and required switching logic.
The 40A relay rating should not be interpreted as a requirement for every connected device to draw 40A.
It is an electrically operated switch that uses a 12V control circuit to switch an automotive electrical load, with a relay current rating of 40A.
A 4-pin relay normally provides a simple normally open switching function. A 5-pin changeover relay adds terminal 87a, allowing terminal 30 to switch between a normally closed and normally open output.
Pins 85 and 86 operate the relay coil, pin 30 is the common switching contact and pin 87 is the normally open output.
Terminal 87a is the normally closed contact on a 5-pin changeover relay. It is connected to terminal 30 while the relay coil is not energized.
No. Relay rating and fuse rating serve different purposes. Fuse selection should be based on the connected load, conductor size and required circuit protection.
Cozy Electronics provides OEM and ODM support for automotive relays, relay sockets, relay boxes, wiring harnesses and customized electrical assemblies. Buyers can provide coil voltage, contact configuration, current requirements, terminal layout and application information for project evaluation.
Contact Cozy Electronics for automotive relay specifications, bulk purchasing and OEM/ODM requirements.
