ABB 1SVR730841R0200 Current Monitoring Relay, Single-Phase

The ABB 1SVR730841R0200 (CM-SRS.11S) is a single-phase current monitoring relay engineered to provide accurate over- or undercurrent detection in AC or DC systems. Using a true RMS measuring principle, it reliably monitors current within ranges from 3 mA up to 1 A — ensuring dependable performance even if waveforms are distorted. Users can configure the relay to trigger when current exceeds a threshold (overcurrent) or drops below a set value (undercurrent), with adjustable hysteresis (3–30%) and an adjustable tripping delay between 0.1 and 30 seconds — allowing for precise control and avoidance of nuisance trips.

Why It Helps
This relay helps protect motors, pumps, heaters, or other single-phase equipment from damage due to unexpected overloads or no-load conditions. With its adjustable thresholds and delay, you can tailor protection to the exact needs of your system — whether you’re guarding against motor overcurrent on startup or detecting a loss-of-load condition. The DIN-rail mounting and screw-clamp terminals make installation straightforward in industrial control panels, while the front-face LEDs give at-a-glance system status.

Key Highlights

• Configurable overcurrent or undercurrent monitoring for flexible protection.

• Wide measuring range from 3 mA to 1 A — suitable for low-current sensors up to small motors.

• True RMS measuring ensures accurate detection in both AC and DC circuits, even with non-sinusoidal current.

• Adjustable hysteresis (3–30%) and adjustable trip delay (0.1–30 s) for fine-tuned protection and to avoid false triggers.

• Single SPDT (1 c/o) contact output rated 4 A at 250 V AC for integration with contactors or alarms.

• DIN-rail (TH35) mounting and screw-clamp terminals with double chamber cage — easy installation in standard control cabinets.

• Front-face LED indicators for supply presence, over/undercurrent event, and relay status for quick diagnostics.

Applications
Ideal for industrial and commercial control panels where single-phase circuits power motors, pumps, heaters, or lighting. Use it to protect against overloads, detect loss-of-load (undercurrent), guard equipment from damage, or trigger alarms/contactor activation under abnormal current conditions. The ABB 1SVR730841R0200 brings reliable current monitoring and protection to standard single-phase electrical systems.

Reliability
ABB’s CM-SRS series has proven durability, with robust screw-clamp terminals for vibration resistance and long operational life — making the relay a dependable choice for continuous industrial operation.