JSY-21B Type Voltage Loss TimerDetailed product description：

The JSY-21A voltage loss timer is suitable for monitoring the operation status of three-phase three wire, three-phase four wire, active and reactive energy meters used for power metering. When there is a loss of voltage in the line, the instrument can automatically record the time and number of losses, and sound and light alarms. The product is also equipped with a phase sequence indicator circuit to enable the power metering department to compensate for human or non-human leakage of electrical energy. The use of this instrument is of great significance in strengthening electricity management and improving the level of metering management.

2、 Specification and Model of JSY-21A Voltage Loss Timer

specification	wiring method	input voltage	Rated Current
JSY-21A type	three-phase three-wire	3×100V	5A
JSY-22B type	three-phase four-wire	3×380V/220V	5A

3、 Technical indicators:
1. Timing error:2. Action current: adjustable from 0.3-5% of the calibration current (factory adjusted to 15 Ma)
3. Action voltage: 65% ± 2V of the reference voltage
4. Return voltage: 75% ± 2V of the reference voltage
5. Loop impedance: 0.05 ohms (0-5A)
6. Timing range: 9999.99-0.01h
7. Power consumption of the whole machine:<5VA
8. Three phase simultaneous voltage loss continuous working time ≤ 15 days