Power Relay 30A 5 Pin

Haltech 30A 5-Pin Power Relay: Reliable Electromechanical Switching

The humble relay is the workhorse of automotive electronics, acting as the bridge between low-current logic signals and high-current power delivery. The Haltech Power Relay 30A 5-Pin is a premium electromechanical switch designed for the rigors of motorsport and high-performance street applications. Unlike standard 4-pin relays, this 5-pin unit features Single Pole Double Throw (SPDT) architecture, providing both a Normally Open (NO) and a Normally Closed (NC) circuit. This versatility makes it indispensable for complex wiring logic, such as switching between two devices, creating safety interlocks, or simply driving high-load components like fuel pumps, cooling fans, and auxiliary lighting with absolute reliability.

Engineering Deep-Dive: SPDT Logic and Contact Integrity

At the core of this relay is a solenoid coil (Pins 85 and 86) which, when energized by a low-current trigger (from an ECU or switch), creates a magnetic field that pulls a movable armature. This armature switches the common contact (Pin 30) from the Normally Closed output (Pin 87a) to the Normally Open output (Pin 87). This Changeover functionality is what separates professional wiring solutions from basic setups. For example, the NC contact can be used for electric brake lockouts or fail-safe indicators.

The contacts themselves are engineered to handle a continuous load of 30 Amperes at 12 Volts DC. They are constructed from silver-alloy material to resist arcing and welding—a common failure mode in cheap relays where the contacts stick together, causing a component to run continuously and drain the battery. The internal spring mechanism is calibrated to provide a rapid “break” action, minimizing the arc duration when the circuit is opened, which is critical for longevity when driving inductive loads like electric motors.

Operational Benefits

• Versatile Logic: 5-Pin design allows for both “Power on Trigger” (Pin 87) and “Power off Trigger” (Pin 87a) configurations.
• High Current Capacity: Safely switches up to 30A, suitable for Bosch 044 fuel pumps, large radiator fans, and HID lighting ballasts.
• Standard Footprint: Fits standard automotive relay sockets and Haltech Relay Boxes.
• Durability: Sealed case design protects internal contacts from dust and moisture ingress.

Fitment and Compatibility

This is a standard automotive ISO relay footprint, making it universally compatible with most fuse/relay blocks, including Haltech’s own power distribution modules.

• Coil Voltage: 12V DC.
• Pin Configuration: 30 (Common), 85 (Coil Ground), 86 (Coil Positive), 87 (NO), 87a (NC).
• Mounting: Designed for socket mounting (no integrated mounting tab on the case).

Technical Specifications

Summary & What’s Included

Includes:

• 1 x 30A 5-Pin Relay (No mounting tab)

Note: Ensure you are using a relay socket with appropriate wire gauge terminals for the 30A load.