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1SVR740100R0300 ABB CT-ERS.21P ON-Delay Timer Relay 2C/O
ABB CT-ERS.21P electronic ON-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.
£70.41
Why Choose the ABB CT-ERS.21P ON-Delay Timer?
The ABB CT-ERS.21P is a reliable electronic ON-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 relay range, it provides a dedicated ON-delay function with selectable timing ranges and two changeover relay contacts for flexible control applications.
The CT-ERS.21P provides 10 selectable time ranges from 0.05 s to 300 h, allowing accurate timing control across a wide variety of industrial applications. Front-face operating controls provide straightforward adjustment, while the Easy Connect push-in terminals enable tool-free electrical installation.
With a rated control supply voltage of 24–240 V AC/DC and 2 c/o (SPDT) relay contacts, the CT-ERS.21P is suitable for machinery, automation and electrical control circuits where a controlled delay is required before the output contacts change state. Its compact 22.5 mm housing is designed for DIN-rail mounting within control cabinets.
Key Advantages
- Reliable ON-delay timer relay for industrial control applications.
- 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.
- Precise timing adjustment using front-face operating controls.
- Tool-free Easy Connect push-in terminals simplify installation and maintenance.
Key Features
- ABB CT-ERS.21P ON-delay timer relay.
- 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.
- Contacts rated up to 250 V / 4 A.
- Maintenance-free Easy Connect push-in terminal technology.
- Precise adjustment through front-face operating controls.
- Compact 22.5 mm wide DIN-rail housing.
- Two LEDs provide status indication.
Reliable Time-Delayed Control for Industrial Automation
ON-delay timer relays such as the ABB CT-ERS.21P provide controlled switching after a defined time period has elapsed. This makes them useful for sequencing, interlocking and delayed operation within industrial machinery and electrical control systems.
The CT-ERS.21P combines a dedicated ON-delay function with ten selectable time ranges, allowing the same timer relay to accommodate applications ranging from short switching delays through to extended timing periods. Its two changeover relay outputs provide flexible switching, while the compact DIN-rail design supports straightforward installation in control cabinets.
Typical Applications
- Industrial automation and control panels.
- Delayed starting and sequencing circuits.
- Machine control and production equipment.
- Motor and actuator control systems.
- Electrical interlocking and timing circuits.
- Lighting and building control systems.
- 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 | On-delay | |
| Switching Current (A) | 4 A | |
| Series | CT-S Time Relays | |
| ABB order code | 1SVR740100R0300 | |
| Product type | Electronic ON-delay timer relay | |
| Product group | 310926-Timer Relays | |
| Timing function | ON-delay | |
| Time ranges | 10 | |
| Time range | 0.05 s to 300 h | |
| Rated control supply voltage | 24–240 V AC/DC | |
| Rated operational voltage | 250 V | |
| Rated frequency | 50 / 60 Hz | |
| Output | 2 c/o (SPDT) contacts | |
| Contact rating | 250 V / 4 A | |
| Terminal type | 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 | 0.121 kg | |
| Operating temperature | -40 to +60 °C | |
| Storage temperature | -40 to +85 °C | |
| Protection rating | IP50 housing / IP20 terminals |
Frequently Asked Questions
What is the ABB CT-ERS.21P used for?
The CT-ERS.21P is an electronic ON-delay timer relay used to provide controlled time-delayed switching in industrial automation and electrical control systems.
What timing range does the CT-ERS.21P provide?
The timer provides 10 selectable time ranges from 0.05 s to 300 h.
What supply voltage does the CT-ERS.21P require?
The CT-ERS.21P operates from a rated control supply of 24–240 V AC/DC.
How many relay outputs does the CT-ERS.21P have?
The timer has 2 c/o (SPDT) relay contacts, providing flexible changeover switching for electrical control circuits.
How is the CT-ERS.21P installed?
The CT-ERS.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.
