Name: Relay 5-Pin 40A - Royal Electronics Technology Center Co.
Price: 23.85 CAD
Availability: InStock

Relay 5-Pin 40A

$23.85

Relay 5-Pin 40A

*DC 12 V

*NC/NO

A 5-pin 40-amp relay is an electromechanical switch commonly used in automotive and other applications to control a higher-power circuit using a low-power signal.

It has five terminals: two for the control circuit (coil) and three for the switched circuit (contacts). The 40-amp rating indicates the maximum current the relay’s contacts can safely switch.

Key features and characteristics:

5 Pins:

Unlike a 4-pin relay, a 5-pin relay has an extra terminal (often labeled 87a) which provides a normally closed (NC) contact in addition to the normally open (NO) contact.
40 Amp Rating:

This means the relay’s contacts can handle a maximum current of 40 amps without overheating or failing.
SPDT (Single Pole Double Throw):

This refers to the switching capability of the relay. It can switch between two circuits (one normally open and one normally closed).
12V Coil:

Most automotive relays operate on 12V DC, meaning the coil is designed to be energized by a 12V power source.

How it works:

1. Control Circuit (Coil):

When a small current is applied to the two coil terminals (usually pins 85 and 86), it creates a magnetic field.
2. Magnetic Field:

The magnetic field attracts an armature, which is a moving part inside the relay.
3. Switching Contacts:

The movement of the armature changes the state of the contacts (pins 30, 87, and 87a).
4. Switched Circuit:

This switching action allows a higher current from a separate power source (e.g., battery) to flow through the relay’s contacts to a connected device (e.g., lights, horn, etc.).

Common Applications:

Automotive: Controlling headlights, fog lights, horns, fuel pumps, and other high-current accessories.
Industrial Control: Switching motors, solenoids, and other heavy-duty equipment.
General Purpose: Any application where a low-power signal needs to control a higher-power circuit.