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Marsh Bellofram Diversified Electronics Division SLD-Series Phase & Under Voltage Monitor

Marsh Bellofram Diversified Electronics Division SLD-Series Phase & Under Voltage Monitor

Product catalog summary

Overview: The SLD Series Phase Voltage Monitors are designed to protect 3-phase equipment from issues such as Phase Unbalance, Phase Loss, Under Voltage, and Phase Reversal. The device ensures that the internal relay energizes when the correct phase sequence is present and de-energizes when any irregularities occur. It automatically resets when conditions normalize.

Key Features:

Adjustable Release Delay to prevent nuisance tripping due to momentary voltage fluctuations.
Compatible with both Delta and Wye systems without requiring neutral connections in Wye systems.
Detects regeneration conditions when a phase is lost during motor operation.

Specifications:

Operating Voltage: Refer to the model-specific table.
Transient Protection: 1000 Volts for 8 mSEC.
Automatic Reset with phase sequence ABC (not CBA).
Phase Unbalance Range: Adjustable from 2% to 10%.
Indicators: LED lights up when conditions are normal.
Response Times: Operate in 30 mSEC; Release adjustable from 0.1 to 20 SEC for Under Voltage, 100 mSEC for Phase Reversal and Unbalance.
Temperature Rating: Operates from 32° to +131°F (0° to +55°C); Storage from -49° to 185°F (-45° to +85°C).
Weight: 13.5 oz.

Model Variants:

SLD-120-ASA: 120 VAC, Under Voltage Drop-Out Range 95-115 Adj., SPDT, 10 Amp, Resistive @ 240 VAC.
SLD-230-ASA: 208/240 VAC, Under Voltage Drop-Out Range 185-230 Adj.
SLD-380-ASA: 380 VAC, Under Voltage Drop-Out Range 315-390 Adj.
SLD-440-ASA: 440/480 VAC, Under Voltage Drop-Out Range 370-460 Adj.
SLD-120-ALE: 120 VAC, Under Voltage Drop-Out Range 95-115 Adj., DPDT, 5 Amps, Resistive; 345 VA, Inductive @ 240 VAC.
SLD-230-ALE: 208/240 VAC, Under Voltage Drop-Out Range 185-230 Adj.
SLD-380-ALE: 380 VAC, Under Voltage Drop-Out Range 315-390 Adj.
SLD-440-ALE: 440/480 VAC, Under Voltage Drop-Out Range 370-460 Adj.

Additional Information: All voltage references are phase-to-phase. The enclosure styles are specified as Style A or Style E, with specific power requirements and output ratings for each model.

Catalog excerpts

Marsh Bellofram Diversified Electronics Division SLD-Series Phase & Under Voltage Monitor -1

800.727.5646 atcdiversified.com Diversified Electronics SLD Series Phase Voltage Monitors // SLD Series 223 Pha s e & Un der Vo l t a g e M o n i t or The SLD Series is designed to protect 3-phase equipment against Phase Unbalance, Phase Loss, Under Voltage and Phase Reversal conditions. With normal operating voltage present on all three phases in the proper phase sequence, the internal relay will energize (PICK-UP). When an incorrect phase sequence or phase loss occurs or the three-phase line voltages fall outside the preset unbalance or under voltage settings, the internal relay will de-energize (DROP-OUT). When all conditions return to normal, the relay will reset. The Adjustable Release Delay is provided to ignore momentary voltage fluctuations that cause nuisance tripping. 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 SLD series is designed to detect this condition when properly adjusted. \\\OPERATION \\\SPECIFICATIONS OPERATING VOLTAGE See Table Below TRANSIENT PROTECTION 1000 Volts For 8 mSEC RESET Automatic PHASE SEQUENCE ABC (Will Not Operate CBA) PHASE UNBALANCE RANGE 2% to 10%, Adjustable INDICATORS LED Glows When All Conditions Are Normal RESPONSE TIMES Operate 30 mSEC Release 0.1 to 20 SEC, Adjustable (on Under Voltage only); 100 mSEC on Phase Reversal and Unbalance 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 13.5 oz. \\\DIMENSIONS (INCHES) \\\WIRING Style E STYLE E Style A MODEL NUMBER OPERATING VOLTAGE UNDER VOLTAGE DROP-OUT RANGE POWER REQUIRED HYSTERESIS OUTPUT RATING ENCLOSURE SLD-120-ASA 120 VAC 95-115 Adj. 3 VA Max. 2.5 VAC SPDT, 10 Amp, Resistive @ 240 VAC 1/2 Hp @ 240 VAC A SLD-230-ASA 208/240 VAC 185-230 Adj. 5.0 VAC SLD-380-ASA 380 VAC 315-390 Adj. 10 VAC SLD-440-ASA 440/480 VAC 370-460 Adj. SLD-120-ALE 120 VAC 95-115 Adj. 5 VAC DPDT, 5 Amps, Resistive; 345 VA, Inductive @ 240 VAC E SLD-230-ALE 208/240 VAC 185-230 Adj. SLD-380-ALE 380 VAC 315-390 Adj. 7 VA Max. 10 VAC DPDT, 3 Amps, Resistive; 360 VA, SLD-440-ALE 440/480 VAC 370-460 Adj. Inductive @ 600 VAC All voltage referenced are phase-to-phase. STYLE A–RB-08 or OT-08

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