ABB – CT‑ARS.21S (1SVR730120R3300) – Electronic Off‑Delay Timer Relay

The ABB CT‑ARS.21S is a single-function electronic off-delay (delay-on-break) timer from ABB’s CT-S series. It operates over a wide voltage range of 24–240 VAC/DC, offers ten timing ranges from 0.05 s to 300 h, and provides 2 changeover (SPDT) relay outputs rated at 4 A @ 250 VAC. Ideal for industrial control panels requiring delayed shutdown sequences.

Key Features & Specifications

• Model / P/N: CT‑ARS.21S / 1SVR730120R3300  

• Function: Off‑delay timer (delay starts after control voltage is removed)

• Control Voltage: 24–240 V AC or DC  

• Time Ranges: Selectable 10 steps from 0.05 s to 300 h  

• Outputs: 2 × SPDT (1 CO each); 4 A resistive @ 250 VAC (3 A inductive)  

• Indicators: LEDs indicate “U/T” (power/timing) and “R” (relay status)  

• Connections: Screw terminals with double-chamber cage clamp (UL/CSA rated)  

• Dimensions: 22.5 × 85.6 × 103.7 mm (W×H×D); 0.124 kg net  

• Certifications: CE, UL 508, CSA C22.2 No.14, GL, GOST, CCC, RoHS  

• Durability: 100,000 electrical cycles; 30 million mechanical cycles