YC7VAN-3 Three-phase Overvoltage and Undervoltage Protector

Picture

YC7VAN-3 Three-phase Overvoltage and Undervoltage Protector

The YC7VAN-3 is a high-performance three-phase line protection device. It continuously monitors the effective values of three-phase voltage and current, and can quickly disconnect the circuit when preset overvoltage or undervoltage faults are detected, effectively preventing electrical equipment damage and safety accidents caused by power grid abnormalities or equipment malfunctions. After the fault is eliminated, the device supports automatic reset to restore power supply

Product Details

General

YC7VAN-3 Three-phase Overvoltage and Undervoltage Protector 2

Feature

Voltage and current display relay used in administrative, industrial and residential buildings and has the function of protecting single-phase lines:

• Undervoltage protection;

• Overvoltage protection;

• Working under voltmeter mode;

• Overcurrent proteciton.

Type designation

Technical data

Item		AC 220V					AC 380V
Rated supply voltage		AC 220V					AC 380V
Operating voltage range		AC 80-400V(Three phase)					AC 140-700V (Three phase)
Rated frequency		50/60Hz					50/60Hz
Electric current adjusting range		1-40A/63A/80A/100A					1-40A/63A/80A/100A
Over-voltage setting range		230-300V (220V)					390-500V(380V)
Under-voltage setting range		165-295V (220V)					280-465V(380V)
Rated current		40A/63A/80A/100A					40A/63A/80A/100A
U<and U>trip delay		0.1-30s					0.1-30s
Reset/start delay		1-500s					1-500s
Voltage measurement accuracy		±2%					±2%
Rated insulation voltage		400V					700V
Output contact		1NO					1NO
Electrical life		10⁵					10⁵
Mechanical life		10⁶					10⁶
Protection degree		IP20					IP20
Pollution degree		3					3
Altitude		≤2000m					≤2000m
Operating temperature		-5℃~+55℃					-5℃~+55℃
Humidity		≤50%at 40℃(without condensation)					≤50%at 40℃(without condensation)
Storage temperature		-30℃~+70℃					-30℃~+70℃

Rated supply voltage	AC 220V					AC 380V
Current specification	40A		63A	80A	100A	40A		63A	80A	100A
Rated operating current(In)	40A		63A	80A	100A	40A		63A	80A	100A
Maximum operating current(A)	63A		80A	100A	125A	63A		80A	100A	125A
Maximum power of load (kW)	8.8		13.9	17.7	22	15.2		24	30.4	38

Overall and mounting dimensions(mm)

YC7VAN-3 Three-phase Overvoltage and Undervoltage Protector Overall and mounting dimensions

Button Explanation

FAQ About Three Phase Overvoltage and Undervoltage Protectors

Below are the high-intent FAQ topics for YC7VAN-3 Three Phase Overvoltage and Undervoltage Protector pages. These questions focus on what users most often search before selecting, installing, or comparing a three-phase voltage protection device.

What is a three phase overvoltage and undervoltage protector?

A three phase overvoltage and undervoltage protector is a device that continuously monitors three-phase voltage and disconnects the circuit when the voltage exceeds or drops below preset limits. It helps protect motors, pumps, compressors, panels, and other three-phase equipment from power abnormalities.

How does a three phase voltage protector work?

A three phase voltage protector monitors the effective values of voltage and current on each phase. When it detects abnormal conditions such as overvoltage, undervoltage, overcurrent, voltage unbalance, or incorrect phase sequence, it trips the circuit to protect connected equipment. After the fault is cleared, YC7VAN-3 supports automatic reset to restore power supply. :contentReference[oaicite:1]{index=1}

Why is overvoltage and undervoltage protection important for three phase systems?

Voltage abnormalities can damage sensitive electrical equipment, reduce motor life, cause overheating, and lead to unexpected shutdowns. A three phase voltage protector helps maintain system safety and reliability by disconnecting the load before abnormal voltage conditions cause serious damage.

What is the difference between a three phase voltage protector and a circuit breaker?

A circuit breaker mainly protects against overload and short circuit, while a three phase voltage protector is designed to monitor and react to voltage-related faults such as overvoltage, undervoltage, voltage unbalance, and phase sequence errors. In many systems, the two devices are used together for more complete protection.

What is phase sequence protection and why is it important?

Phase sequence protection detects whether the order of the three phases is correct. If the phase sequence is wrong, motors may run in the wrong direction, which can damage machinery or affect system operation. YC7VAN-3 includes a phase sequence protection function that can be switched on or off. :contentReference[oaicite:2]{index=2}

What is three phase voltage unbalance protection?

Three phase voltage unbalance protection monitors the difference between phase voltages. When the voltage difference becomes too large, the protector trips to prevent overheating, vibration, reduced efficiency, and possible damage to motors and other three-phase loads. YC7VAN-3 supports adjustable voltage unbalance settings. :contentReference[oaicite:3]{index=3}

Can a three phase voltage protector also provide overcurrent protection?

Yes. In addition to overvoltage and undervoltage protection, YC7VAN-3 also provides overcurrent protection. It supports adjustable current ranges of 1–40A, 63A, 80A, or 100A depending on the model, helping protect circuits and equipment from excessive current conditions. :contentReference[oaicite:4]{index=4}

How do I choose the right three phase voltage protector?

The right model should be selected based on system voltage, rated current, load power, and required protection functions. YC7VAN-3 is available for AC 220V and AC 380V systems, with rated current options of 40A, 63A, 80A, and 100A, making it suitable for a wide range of residential, commercial, and industrial applications. :contentReference[oaicite:5]{index=5}

Where are three phase overvoltage and undervoltage protectors used?

These protectors are commonly used in industrial plants, commercial buildings, distribution boards, pump systems, HVAC systems, compressors, and other three-phase installations where stable voltage and reliable equipment protection are critical.

Does a three phase voltage protector reset automatically after a fault?

Many modern three phase voltage protectors support automatic reset after fault recovery. YC7VAN-3 includes adjustable reset and start delay settings, allowing power to be restored automatically after the fault condition is removed and the system returns to normal. :contentReference[oaicite:6]{index=6}