ABB TEF4-ON 4-Channel Industrial Safety Relay Module

ABB TEF4-ON is a frontal electronic timer accessory designed to provide ON-delay timing for ABB TEF4 contactors and contactor relays by plugging directly onto the coil terminals, A1–A2. It supports time-delayed ON functions up to 100 seconds across three timing ranges and is part of ABB's TEF4 family, including TEF4-OFF and TEF4-S-ON variants. The coil version commonly available for this timer is 240 V AC (catalog 1SBN020112R1000), with a direct plug-in connection to the coil terminals, enabling compact, integrated timing without external wiring. Typically used to control sequencing or start-up delays in automation applications where a precise on-delay is required for actuators, valves, or relays, this TEF4-ON accessory ensures predictable activation timing and helps coordinate machine start-up or stop processes in a variety of control circuits. It is documented in ABB literature and catalogues, including ABB's official literature and distributor listings, as a plug-in timing accessory for TEF4 relays.