Hella 933332421 Mini ISO Change-Over Relay 24V SPDT 5-Pin

The Hella 933332421 is a Mini ISO change-over relay (SPDT / Form C) designed for 24-volt electrical systems in heavy-duty trucks, commercial vehicles, and vocational equipment. Built to OEM-grade standards, this relay delivers reliable switching performance across a broad range of automotive and commercial applications.

Key Features:

• Contact Form: SPDT (Single Pole Double Throw) / Form C — change-over configuration with terminals 30, 85, 86, 87, and 87a
• Rated Voltage: 24V DC
• Rated Current: 20A (Ohmic / Resistive Load)
• Inductive Load: 5A
• Capacitive Load: 5A
• Operating Temperature Range: -40°C to +125°C (-40°F to +257°F)
• Pin Count: 5-pin Mini ISO footprint
• Contact Arrangement: Make contact (87) and break contact (87a) — can function as either a make or break relay

Change-over relays switch the load circuit between two separate outputs, making them ideal for dual-speed or two-stage applications such as heated rear windows, fan motors, horn systems, fuel pumps, and auxiliary lighting circuits. When the control circuit is energized, the armature closes the make contact (87) and opens the break contact (87a).

Hella manufactures over 100 million relays per year and holds certifications including DIN EN ISO 9001 and ISO 14001, ensuring consistent quality trusted by OEM vehicle manufacturers worldwide. The 933332421 is a direct-fit Mini ISO relay compatible with standard 5-pin relay sockets and harnesses.