The ABB CT-MFD.21 is a multifunction electronic time relay providing 7 timing functions with a range of 0.05 seconds to 100 hours, suitable for both AC and DC voltage applications.
Product ModelCT-MFD.21
Material Number1SVR500020R1100
Product ID83454
Stock on Request
Last updated: 8/29/2026
Key Features
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1. Versatile Timing FunctionsThe CT-MFD.21 offers 7 distinct timing functions, allowing for precise control over various applications. Whether you need to manage short intervals or extended periods, this relay has you covered with a range from 0.05 seconds to 100 hours.
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2. Dual Voltage CompatibilityThis multifunction time relay supports both AC and DC voltage, making it adaptable to a wide range of electrical systems. This compatibility ensures that the CT-MFD.21 can be seamlessly integrated into your existing infrastructure.
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3. Reliable PerformanceDesigned for reliability and stability, the CT-MFD.21 is built to withstand the demands of industrial environments. Its robust design ensures consistent performance over extended periods, making it a trusted choice for critical applications.
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4. Flexible Output OptionsThe relay features 2 SPDT (c/o) output contacts, allowing for flexible control over your system. This configuration enables you to manage multiple cycles and ensure that your operations run smoothly and efficiently.
Technical Specifications
Detailed engineering parameters based on manufacturer documentation
Specifications may be subject to change without notice
Parameter
Value
Parameter
Value
Product Net Width
17.5 mm
Product Net Height
80 mm
Product Net Depth / Length
63 mm
Product Net Weight
0.066 kg
Timer Relay Type
ON-Delay OFF-Delay Impulse ON Impulse OFF Flasher Starting with ON Flasher Starting with OFF Pulse Former
Time Range
0.05 s ... 100 h
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5. Easy IntegrationWith its compact design and straightforward control input, the CT-MFD.21 is easy to integrate into your existing control systems. Its user-friendly interface simplifies setup and operation, reducing the need for extensive training or technical expertise.
Rated Control Supply Voltage (Us)
12 ... 240 V AC/DC
Rated Operational Voltage
Auxiliary Circuit 250 V
Rated Frequency (f)
50 / 60 Hz DC
Output
2 c/o (SPDT) contacts
Terminal Type
Screw Terminals
Rated Operational Current AC-12 (Ie)
(230 V) 5 A
Rated Operational Current AC-15 (Ie)
(230 V) 3 A
Rated Operational Current DC-12 (Ie)
(24 V) 5 A
Rated Operational Current DC-13 (Ie)
(24 V) 1 A
Rated Impulse Withstand Voltage (Uimp)
Input Circuit 4 kV
Rated Insulation Voltage (Ui)
Input Circuit / Output Circuit 300 V Output Circuit 1 / Output Circuit 2 300 V
Degree of Protection
Housing IP50 Terminals IP20
Overvoltage Category
III
Pollution Degree
3
Short-Circuit Protective Devices
Output Circuit NC - F Type Fuses 6 A Output Circuit NO - F Type Fuses 6 A
