Install Bay RL3040 Economy 12V 30/40 Amp SPDT Automotive Relay

The Install Bay RL3040 is an economy-grade, Bosch-style 5-pin SPDT (Single Pole Double Throw) relay designed for 12-volt automotive, marine, and powersports electrical systems. Rated at 30/40 amps, it delivers reliable switching performance for a wide range of low-voltage applications without the premium price tag.

Key Features:

• 12V DC operation — compatible with standard automotive electrical systems
• 30/40 amp dual rating — 40A on normally open (NO) circuit, 30A on normally closed (NC) circuit
• 5-pin SPDT configuration — Bosch-style design compatible with standard relay sockets and harnesses
• Economy pricing — ideal for installations requiring multiple relays
• Compatible with standard 0.250" (1/4") female disconnect terminals

Common applications include car audio and stereo installations, vehicle security and remote start systems, HID and auxiliary lighting, fog lights, and general automotive accessory switching. The RL3040 follows the widely adopted Bosch relay standard, making it compatible with most aftermarket relay sockets and wiring harnesses.