VMD258CH-D-2 Unter-/ Überspannungsrelais
Product description
The VMD258 voltage relay monitors three-phase AC voltage networks for undervoltage and overvoltage (window function). It does not require a neutral point connection and is therefore universally suitable for 3AC systems.
The supply voltage for the electronics is taken from the network to be monitored. The supply for the electronics, the relays and the connection for the external energy storage device are isolated from the mains with double insulation. Special input transformers attenuate the transmission of interference factors from the system.
The response values for undervoltage and overvoltage as well as the response delays are infinitely adjustable.
Replaces devices from the SUR35x series.
Features and functions:
- High availability due to pure analog technology
- Undervoltage and overvoltage monitoring for 3AC systems
- No separate supply voltage
- Separate alarm relays for undervoltage and overvoltage, each with 2 potential-free changeover contacts
- Adjustable response value: 0.7...0.95 x Un/1.05...1.3 x Un
- Nominal mains voltages: 3AC 690/500/480/440/400/230/110/100 V
- Adjustable response delay: 0...5 s
- Indicator LEDs for operation, overvoltage, undervoltage
Technical features:
- Supply voltage Us AC 690 V
- Rated voltage AC 1000 V
- Undervoltage response values 0.7....0.95 x Un
- Response values overvoltage 1.05....1.3 x Un
- Switching elements 2x2 changeover contacts
- Weight: 825g
- Dimensions: W 107.5 x H 100 x D 110.1 mm
Applications:
- Monitoring the supply to machines and systems
- Monitoring of consumers
- Switching systems on and off above a certain voltage
- Monitoring emergency or backup power supplies
- Monitoring the supply voltage of mobile loads