SSAC TRM120A2X300 0489 Time Delay Relay

The SSAC TRM120A2X300 0489 Time Delay Relay is a TRM-series timer that provides a controlled, delay-on-make action in electrical circuits. Designed for 120 VAC operation, this model creates a timed pause before its output contacts close, enabling safe sequencing of loads in control panels, HVAC equipment, and other automation circuits. The 300 suffix indicates a 300-second (5-minute) timing interval, with the family also offering shorter delays (for example, 30 seconds in the X30 variants) to fit different control philosophies. SSAC, a Littelfuse timer brand, uses an electromechanical output relay in the TRM family to deliver the timed switching action, which energizes at the end of the set delay. The identifier 0489 helps track this specific unit within the TRM120A2X300 lineup for inventory, repair, or replacement purposes.