Modular voltage control relay | digital | overvoltage and undervoltage protection | 1P | 40A | 230VAC | DIN | automatic reset

Technical Specifications

Product type: digital voltage protection relay
Purpose: overvoltage and undervoltage protection
Rated voltage: AC220V (L-N)
Rated current: 40A
Network frequency: 50/60Hz
Polarity: 1P
Mounting: DIN rail
Incoming line direction: top input, bottom input
Automatic reset time: 2–900 s
Factory reset time: 30 s
Detection accuracy: ≤2%
Delay tolerance: ±10%
Network delay indicator (Lag rate): 5%
Load: AC max. 3VA
Mechanical lifetime: up to 1 million cycles
Electrical lifetime: up to 100,000 cycles
Operating ambient temperature: -5°C ~ +40°C
Construction: modular
Contact type: protective
Housing: sealed
Certificates: CE

Functions

Overvoltage protection – automatically disconnects the electrical circuit when the network voltage rises to a dangerous level
Undervoltage protection – protects equipment from unstable operation caused by low voltage
Automatic power restoration – after the network stabilizes, the relay automatically restores power after the set time
Adjustable reset delay – can be set from 2 to 900 seconds according to system requirements
Real-time digital network monitoring – continuously analyzes network voltage parameters
DIN rail mounting – quick integration into standard electrical distribution boards
High measurement accuracy – detection error does not exceed ≤2%
Long service life construction – up to 1 million mechanical operating cycles
Protection for sensitive electronics – reduces the risk of failures caused by unstable power supply

Applications

For household users: Helps protect home electronics from unstable electrical networks and costly failures
For electricians: Convenient DIN mounting and universal application allow quick integration into standard electrical panels
For automation engineers: Useful for protecting sensitive PLCs, inverters, and control systems
For commercial facility administrators: Helps reduce equipment failures and downtime risks
For solar power installers: Additional protection for inverters and automation systems

Advantages

Automatic overvoltage protection
Automatic undervoltage protection
Adjustable reset time
Digital network monitoring
High measurement accuracy
Compact DIN format
Suitable for household and commercial equipment
CE certification
Automatic power restoration

Disadvantages

Designed for single-phase networks
Does not support WiFi or Modbus communication
Does not replace professional SPD surge protection
Requires professional installation
Not intended for outdoor use without additional protection

Frequently Asked Questions

Does this relay protect against both high and low voltage?

Yes, the device automatically disconnects the load in case of both overvoltage and dangerous voltage drops.

Does the relay automatically restore power?

Yes, after the network parameters stabilize, the relay automatically restores power after the configured time.

Can the reset time be adjusted?

Yes, it can be adjusted from 2 to 900 seconds.

Can it be installed in a standard electrical panel?

Yes, the device is designed for standard DIN rail mounting.