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ABB CT-MFS.21S Electronic Timer

1. Product Description

The ABB CT-MFS.21S is a high-precision electronic timer relay designed for delay, cyclic, and sequential logic control applications in industrial automation systems. It supports multiple timing modes to accurately control switching operations, enabling automated management of motors, pumps, lighting, and other industrial loads. The CT-MFS.21S features a modular design for easy installation, maintenance, and replacement, making it suitable for a wide range of industrial environments.

2. Technical Specifications

• Model: CT-MFS.21S

• Relay Type: Electronic timer relay

• Control Voltage: AC/DC 24–240 V

• Output Type: Relay contact output (SPDT / DPDT optional)

• Timing Range: 0.1 s ~ 100 h (depending on model)

• Timing Modes: ON delay, OFF delay, cyclic, interval, etc.

• Contact Rating: Max. 8 A / 250 V AC

• Operating Temperature: –20°C ~ +60°C

• Storage Temperature: –40°C ~ +70°C

• Mounting: DIN rail (35 mm)

• Dimensions: Approx. 22.5 × 90 × 64 mm (W × H × D)

• Indicators: LED shows relay and timing status

3. Features & Advantages

• High-precision timing ensures accurate operation of industrial equipment

• Multiple timing modes for versatile application requirements

• Large contact capacity supports direct control of small to medium loads

• Modular design simplifies installation, maintenance, and replacement

• Clear LED indication for power and operational status

• Wide voltage compatibility supports both AC and DC inputs

• Industrial-grade design withstands vibration, high temperature, and harsh environments

4. Application Areas

• Industrial automation control systems

• Delayed start/stop of motors and pumps

• Lighting and cyclic operations

• Heating and cooling system control

• Production line sequential logic control

• PLC auxiliary control and signal regulation

5. Precautions / Installation Notes

1. Disconnect power before installation to ensure safety.

2. Follow rated voltage and contact capacity to prevent overload damage.

3. Ensure DIN rail is securely mounted to prevent vibration or loosening.

4. Avoid prolonged use in high humidity, corrosive, or strong electromagnetic interference environments.

5. Regularly inspect relay operation and contact condition to ensure accurate timing.

6. Select the appropriate timing mode according to application requirements to avoid operational errors.

The structure and details of the product：

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