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1SVR740120R3300 ABB CT-ARS.21P True OFF-Delay Timer Relay 2C/O
ABB CT-ARS.21P electronic true OFF-delay timer relay with 10 selectable time ranges from 0.05 s to 300 h, 2 c/o relay contacts and 24–240 V AC/DC control supply.
£101.18
Why Choose the ABB CT-ARS.21P True OFF-Delay Timer?
The ABB CT-ARS.21P is a reliable electronic true OFF-delay timer relay designed for precise time-delayed switching in industrial automation, control panels and electrical control systems. As part of the proven ABB CT-S timer range, it provides a true OFF-delay function without requiring an auxiliary voltage, with two changeover relay outputs for flexible control applications.
The CT-ARS.21P provides 10 selectable time ranges from 0.05 s to 300 h, allowing accurate timing control across a wide range of industrial applications. The timer operates from a wide 24–240 V AC/DC control supply and provides 2 c/o (SPDT) relay contacts rated at 250 V / 4 A.
Featuring Easy Connect push-in terminals, front-face adjustment and a compact 22.5 mm DIN-rail housing, the CT-ARS.21P is designed for straightforward installation within industrial control cabinets. Its true OFF-delay operation allows the outputs to remain energised for the selected time after the control voltage is removed.
Key Advantages
- Reliable true OFF-delay timer relay for industrial automation.
- True delay-on-break operation without auxiliary voltage.
- 10 selectable time ranges from 0.05 s to 300 h.
- Wide 24–240 V AC/DC control supply.
- 2 c/o (SPDT) relay contacts for flexible switching.
- Maintenance-free Easy Connect push-in terminals simplify installation.
- Compact 22.5 mm wide DIN-rail housing for control cabinets.
Key Features
- ABB CT-ARS.21P true OFF-delay timer relay.
- True OFF-delay function without auxiliary voltage.
- 10 selectable time ranges.
- 0.05 s to 300 h timing range.
- 24–240 V AC/DC rated control supply.
- 2 c/o (SPDT) relay contacts.
- Relay contacts rated at 250 V / 4 A.
- Easy Connect push-in terminals.
- Precise timing adjustment using front-face operating controls.
- Compact 22.5 mm wide housing.
- LED status indication.
- DIN-rail mounting for control panel installation.
Reliable True OFF-Delay Control for Industrial Automation
True OFF-delay timer relays such as the ABB CT-ARS.21P provide controlled switching after the control voltage is removed. This makes the timer particularly useful where equipment, motors, fans, lighting circuits or other loads need to remain energised for a defined period before switching off.
The CT-ARS.21P combines true OFF-delay operation with ten selectable time ranges and a wide 24–240 V AC/DC control supply. Its two changeover relay outputs provide flexible switching within automation and control circuits, while the compact DIN-rail housing and push-in terminals support efficient panel installation.
Typical Applications
- Industrial automation and control panels.
- Delayed shutdown and run-on circuits.
- Motor and actuator control systems.
- Fan and ventilation run-on applications.
- Machine control and production equipment.
- Lighting and electrical control systems.
- Sequencing and interlocking applications.
- OEM machinery and industrial automation equipment.
Technical Specifications
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| Contacts | 2 C/O | |
|---|---|---|
| Mounting Type | DIN rail | |
| Device Type | Single-function timer | |
| Timing Function | Off-delay | |
| Switching Current (A) | 4 A | |
| Series | CT-S Time Relays | |
| ABB order code | 1SVR740120R3300 | |
| Product type | Electronic true OFF-delay timer relay | |
| Product group | 310926-Timer Relays | |
| Timing function | True OFF-delay / delay on break | |
| Time ranges | 10 | |
| Time range | 0.05 s to 300 h | |
| Rated control supply voltage | 24–240 V AC/DC | |
| Output | 2 c/o (SPDT) contacts | |
| Contact rating | 250 V / 4 A | |
| Auxiliary voltage | Not required for true OFF-delay operation | |
| Terminal type | Easy Connect push-in terminals | |
| Mounting type | DIN rail mounting | |
| Product width | 22.5 mm | |
| Product height | 85.6 mm | |
| Product depth | 103.7 mm | |
| Product net weight | 0.115 kg | |
| Operating temperature | -25 to +60 °C | |
| Storage temperature | -40 to +85 °C | |
| Protection rating | Housing IP50 / terminals IP20 | |
| Rated insulation voltage | 500 V input/output |
Frequently Asked Questions
What is the ABB CT-ARS.21P used for?
The CT-ARS.21P is an electronic true OFF-delay timer relay used to provide controlled time-delayed switching after the control voltage is removed in industrial automation and electrical control systems.
What timing range does the CT-ARS.21P provide?
The timer provides 10 selectable time ranges from 0.05 s to 300 h.
What supply voltage does the CT-ARS.21P require?
The CT-ARS.21P operates from a rated control supply of 24–240 V AC/DC.
How many relay outputs does the CT-ARS.21P have?
The timer has 2 c/o (SPDT) relay contacts, providing flexible changeover switching for electrical control circuits.
How is the CT-ARS.21P installed?
The CT-ARS.21P is designed for DIN-rail mounting and uses Easy Connect push-in terminals for straightforward tool-free electrical installation.
Trusted by Automation Engineers Worldwide
ABB CT-S timer relays are used in industrial automation and control applications where dependable, configurable timing and flexible relay switching are required.
