SCHNEIDER ELECTRIC LV833579SP External SGR Current Sensor

OverviewSCHNEIDER ELECTRIC LV833579SP is a source ground return (SGR) external current sensor for Schneider MasterPact MTZ1 / MTZ2 / MTZ3 air circuit breakers, used for earth fault protection under the MicroLogic X trip unit system. This toroidal current transformer detects residual earth fault current by SGR wiring scheme, and sends sampled signal to the MicroLogic 6.0 X control unit for selective earth fault protection calculation. It is installed around the source neutral return conductor, supporting heavy current distribution applications up to 4000A. It is an official spare part for MTZ breaker protection upgrade and replacement. In power distribution rooms, data center power systems, industrial main switchboards and marine low-voltage distribution retrofit projects, SCHNEIDER ELECTRIC LV833579SP provides reliable earth fault sensing and is a standard LV distribution spare.

FeaturesSCHNEIDER ELECTRIC LV833579SP adopts a rectangular window-type toroidal structure with robust insulated housing. The External SGR Current Sensor is designed specifically for source ground return earth fault protection topology, compatible with MicroLogic X electronic trip units. It features high measurement accuracy, wide frequency response and strong anti-interference performance. The sensor connects to the trip unit via dedicated signal cable, no extra power supply required. It meets low-voltage distribution standards, carries relevant certification and can operate stably in indoor power cabinet environments. SCHNEIDER ELECTRIC LV833579SP must be matched with the corresponding SGR protection logic setting in the breaker control unit after installation.

SpecsSCHNEIDER ELECTRIC LV833579SP SGR earth fault current sensor. The External SGR Current Sensor catalog: LV833579SP. Compatible breaker: MasterPact MTZ1, MTZ2, MTZ3. Compatible trip unit: MicroLogic 6.0 X. Protection function: selective earth fault protection. Type: source ground return (SGR) toroidal CT. Dimension: 217.5 mm × 146 mm × 45 mm. Weight: approx 3.02 kg. Mounting: window type, pass-through conductor installation. Lifecycle: spare part, some regions limited stock. It is stocked as earth fault sensing spare.

Operating ParametersSCHNEIDER ELECTRIC LV833579SP ambient operating temperature: -10℃ ~ +70℃. The External SGR Current Sensor relative humidity: 5%~95% non-condensing. Frequency range: 50–60 Hz. Insulation class: industrial grade. EMC: comply with low voltage power distribution IEC standards.

PrincipleSCHNEIDER ELECTRIC LV833579SP works on the current transformer principle for residual current detection. The External SGR Current Sensor surrounds the source neutral return cable, induces current signal proportional to earth fault residual current, and transmits the analog signal to the MicroLogic X trip unit. The control unit calculates the fault value and triggers selective earth fault tripping or alarm according to protection settings. If internal winding damage or signal line failure occurs, SCHNEIDER ELECTRIC LV833579SP will lose earth fault detection capability.

ApplicationsSCHNEIDER ELECTRIC LV833579SP is widely deployed in industrial main LV switchboards, data center power distribution, commercial building power systems and marine low-voltage distribution panels. The External SGR Current Sensor undertakes residual current sampling for source ground return earth fault protection, cooperating with MasterPact MTZ breakers and MicroLogic X trip units to form selective earth fault protection. SCHNEIDER ELECTRIC LV833579SP is a preferred spare for MTZ breaker earth fault protection modification and maintenance.