ABB – CT-ERS.21 (1SVR630100R0300) – ON-Delay Timer Relay, 2 SPDT, 24–240V AC/DC

The ABB CT-ERS.21 (1SVR630100R0300) is a single-function ON-delay electronic timer relay featuring two changeover (SPDT) contacts and a universal control supply voltage of 24–240 V AC/DC. This timer offers 10 selectable time ranges from 0.05 seconds to 300 hours, making it highly versatile for industrial automation and control applications. The time range is easily set via a rotary switch, with fine adjustment provided by a front-face potentiometer. The relay is housed in a compact 22.5 mm DIN rail mount enclosure and is available with either screw or push-in terminals. Status LEDs indicate supply voltage and relay output status for quick diagnostics. The CT-ERS.21 is designed for robust operation, featuring high mechanical durability and compliance with international standards.

Key Features:

• Function: ON-delay (delay on make)

• Time ranges: 10 selectable, from 0.05 s to 300 h

• Contacts: 2 SPDT (changeover), rated 250 V / 4 A

• Control supply voltage: 24–240 V AC/DC (50/60 Hz)

• Precise time adjustment: Rotary switch and potentiometer

• Status indication: Green LED (supply/timing), yellow LED (relay status)

• Mounting: DIN rail, 22.5 mm width

• Terminals: Screw or push-in (Easy Connect)

• Mechanical life: 30 million operations

• Electrical life: 100,000 cycles at 230 V, 4 A (AC-12)

• Operating temperature: –40°C to +60°C

• Housing: UL 94 V-0 flame retardant

• Protection: IP50 (housing), IP20 (terminals)

• Standards: IEC/EN 61812-1, UL 508, CE