Hella Marine 4RD 933 332-061 24V 20A Changeover Relay

Hella Marine 24V 20A SPDT Changeover Mini Relay

The Hella Marine 4RD 933 332-061 is a high-reliability 24V DC 5-pin Single Pole Double Throw (SPDT) changeover mini relay engineered for heavy-duty marine, commercial vessel, and industrial power control circuits. Designed to switch power between two distinct output loads (or toggle between normally open and normally closed states), it is ideal for dual-station helm switching, horn circuits, navigation light switching, blower control, and automated pump logic loops.

Featuring silver-alloy contacts designed to resist contact welding and material transfer during inductive load switching, the relay carries a 20 Amp continuous rating across its normally open (NO) contact terminals. Its ruggedized plastic casing protects internal electromagnetic components against high ambient engine room temperatures and mechanical shock, while standard 6.3 mm (0.250") spade terminals allow easy plug-in insertion into standard ISO relay sockets or direct terminal wiring.

Key Features

• SPDT Changeover Functionality: 5-pin design allows toggling between two separate output circuits (Terminal 87 and Terminal 87a) using a single coil input.

• 24V DC System Compatibility: Purpose-built coil resistance tuned for 24V commercial vessel battery architectures and heavy transport networks.

• Silver-Alloy Contacts: Resists erosion and pitting under heavy electrical inductive loads such as electric motors, solenoids, and halogen arrays.

• Standard ISO Form-Factor: Compact mini relay body fits industry-standard 5-pin ISO relay sockets, power distribution panels, and harness connectors.

• High Thermal Resistance: Operates reliably across high-ambient temperature zones up to +125°C.