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Marsh Bellofram Diversified Electronics Division SLC Series Phase Unbalance & Loss Monitor

Marsh Bellofram Diversified Electronics Division SLC Series Phase Unbalance & Loss Monitor

Product catalog summary

Overview
The SLC Series is designed to protect 3-phase equipment from Phase Unbalance and Phase Loss conditions. It operates by keeping the internal relay de-energized under normal conditions and energizing it when a fault is detected. This series is compatible with both Delta and Wye systems, without requiring a neutral connection in Wye systems.

Operation
When a phase loss occurs during motor operation, the SLC Series can detect regeneration, a condition where voltage is induced into the open phase. Proper adjustment is necessary for accurate detection.

Specifications

Operating Voltage: Refer to the model-specific table.
Transient Protection: 1000 Volts for 8 milliseconds.
Reset: Automatic.
Phase Unbalance Range: Adjustable from 2% to 10%.
Indicators: LED lights up on fault condition.
Response Times: Operate in 0.08 seconds, release in 0.7 seconds.
Temperature Rating: Operate from 32° to 131°F (0° to 55°C), storage from -49° to 185°F (-45° to 85°C).
Weight: 12.5 oz.

Model Specifications

SLC-120-ALE: 120 VAC, 3 VA max, DPDT, 5 Amps resistive, 345 VA inductive at 240 VAC.
SLC-230-ALE: 208/240 VAC.
SLC-380-ALE: 380 VAC, 7 VA max, DPDT, 3 Amps resistive, 360 VA inductive at 600 VAC.
SLC-440-ALE: 440/480 VAC.

All voltages are phase-to-phase.

Catalog excerpts

Marsh Bellofram Diversified Electronics Division SLC Series Phase Unbalance & Loss Monitor-1

SLC Series Diversified Electronics atcdiversified.com 800.727.5646 222 Phase Voltage Monitors // SLC Series The SLC Series is designed to protect 3-phase equipment against Phase Unbalance and Phase Loss conditions. With normal operating voltages applied to all three phases, the internal relay will remain de-energized (DROPPED-OUT). When a Phase Loss or Phase Unbalance exceeding the pre-selected trip point occurs, the relay will energize (PICK-UP). The SLC series is typically used in conjunction with a shunt trip breaker. Both Delta and Wye systems may be monitored. In Wye systems, connections to neutral are not required. NOTE: When a phase is lost while the motor is running, a condition known as regeneration occurs where a voltage is induced into the open phase nearly equal in magnitude to the normal phase-to-phase voltage. The SLC series is designed to detect this condition when properly adjusted. P h a s e U n b a l anc e & L os s Moni to r \\\OPERATION \\\SPECIFICATIONS OPERATING VOLTAGE See Table Below TRANSIENT PROTECTION 1000 Volts For 8 mSEC RESET Automatic PHASE UNBALANCE RANGE 2% to 10%, Adjustable INDICATORS LED Glows On Fault Condition RESPONSE TIMES Operate 0.08 SEC Release 0.7 SEC TEMPERATURE RATING Operate 32° to +131°F (0° to +55°C) Storage -49° to 185°F (-45° to +85°C) U.S. PATENT NUMBER 4,331,995 WEIGHT 12.5 oz MODEL NUMBER OPERATING VOLTAGE POWER REQUIRED OUTPUT RATING SLC-120-ALE 120 VAC 3 VA Max. DPDT, 5 Amps, Resistive; 345 VA, Inductive @ SLC-230-ALE 208/240 VAC 240 VAC SLC-380-ALE 380 VAC 7 VA Max. DPDT, 3 Amps, Resistive; 360 VA, Inductive @ SLC-440-ALE 440/480 VAC 600 VAC All voltages referenced on this page are phase-to-phase. \\\DIMENSIONS (INCHES) \\\WIRING

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