Why Choose the ABB CM-SFS.22S Current Monitoring Relay?
The ABB CM-SFS.22S 1SVR730760R0500 is a versatile single-phase current monitoring relay designed for simultaneous overcurrent and undercurrent supervision in AC and DC systems. Using an RMS measuring principle, it provides dependable current monitoring for industrial loads, machinery and electrical control applications.
The CM-SFS.22S incorporates three selectable measuring ranges of 0.3–1.5 A, 1–5 A and 3–15 A, providing an overall monitoring capability from 0.3 to 15 A. Adjustable minimum and maximum thresholds enable current-window monitoring, while a fixed 5% hysteresis helps provide stable switching around the selected threshold values.
A wide 24–240 V AC/DC control supply simplifies integration into industrial control systems. The relay provides two changeover contacts rated at 250 V / 4 A, configurable as either a common or separate minimum/maximum signal, together with adjustable start-up and tripping delays, selectable ON/OFF delay, latching and open- or closed-circuit operating principles.
Key Advantages
- Monitors both AC and DC currents using an RMS measuring principle.
- Three selectable ranges cover currents from 0.3 to 15 A.
- Provides simultaneous overcurrent and undercurrent window monitoring.
- Adjustable minimum and maximum current thresholds.
- Wide 24–240 V AC/DC control supply supports flexible integration.
- Configurable 2 × 1 c/o or 1 × 2 c/o output operation.
- Adjustable start-up and tripping delays from instantaneous to 30 s.
- Selectable ON- or OFF-delay, latching and operating principle.
- Three LEDs provide clear operating and output status indication.
- Compact 22.5 mm width conserves DIN-rail space.
Key Features
- ABB CM-SFS.22S current monitoring relay.
- RMS measuring principle for AC and DC currents.
- 0.3–1.5 A measuring range.
- 1–5 A measuring range.
- 3–15 A measuring range.
- Overcurrent and undercurrent monitoring.
- Adjustable minimum and maximum thresholds.
- Fixed hysteresis of 5% of the threshold value.
- 24–240 V AC/DC rated control supply.
- Start-up delay adjustable from instantaneous to 30 s.
- Tripping delay adjustable from instantaneous to 30 s.
- Selectable ON- or OFF-delay operation.
- Selectable open- or closed-circuit operating principle.
- Selectable latching function.
- 2 changeover (SPDT) output contacts.
- Screw connection technology.
Flexible AC/DC Current Window Monitoring up to 15 A
The ABB CM-SFS.22S uses an RMS measuring principle to supervise AC and DC currents across three selectable ranges extending from 0.3 to 15 A. Adjustable minimum and maximum thresholds allow simultaneous undercurrent and overcurrent monitoring, making it possible to identify load loss, overload and other abnormal current conditions.
Its two changeover contacts can operate together as a common signal or independently to provide separate minimum and maximum threshold signals. Adjustable start-up and tripping delays help accommodate temporary current conditions, while selectable ON/OFF delay, latching and open- or closed-circuit operation allow the relay's response to be tailored to the application.
Typical Applications
- AC and DC load current monitoring.
- Overcurrent and undercurrent supervision.
- Motor and machine load monitoring.
- Pump and fan current supervision.
- Heater and heating-element monitoring.
- Detection of load loss and abnormal operating current.
- Industrial process and automation systems.
- Electrical control and distribution panels.
