Comparing relays NR and NRT
to analyze voltage levels
Description
Comparing relays NR and NRT are designated to analyze voltage levels in DC systems with a backup battery. They work in two basic modes:
- disconnector that responds the voltage drops under a preset level
- diode-element (diode block that stabilizes the voltage on the load. In other words it lowers the voltage on the load to a tolerable level while the voltage of a battery can oscillate in a certain range) regulator, that monitors exceeding of the voltage over a preset level
List of the typical applications:
- disconnector - external DC contactor unlinks an appliance (the load) and a battery when the battery is deeply discharged, and links them again when the battery nominal voltage has been restored back
- signalling of the battery voltage drops - information is conveyed via a potential-free contact to a superior system, and it is cancelled when the nominal voltage of the battery has been restored
- signalling of exceeding of the maximum voltage - information is again commited to a superior system via a potential-free contact, and it is cancelled when the voltage has dropped under the preset level
- comparing relay controls one grade of the diode-element so that it lowers the voltage on the load when the voltage tolerance of the load has been broken
It is possible to activate both acoustic and optical indication for all the above applications. It is possible to configure the NR/NRT relays using jumpers.
Manufactured types of the comparing relays
|
Comparing relays NR: transistor (for a DC contactor) and an internal relay output (/DIN = DIN bar mountable) |
NR 24V, NR 24V/DIN |
| NR 48V, NR 48V/DIN | |
| NR 60V, NR 60V/DIN | |
| NR 110V, NR 110V/DIN | |
| NR 220V, NR 220V/DIN | |
|
Comparing relays NRT: transistor output (for a DC contactor) (/DIN = DIN bar mountable) |
NRT 24V, NRT 24V/DIN |
| NRT 48V, NRT 48V/DIN | |
| NRT 60V, NRT 60V/DIN | |
| NRT 110V, NRT 110V/DIN | |
| NRT 220V, NRT 220V/DIN |
Features
- relay or transistor output
- connection to an external contactor
- potential-free switchover contact 8A/250VAC
- external optical (LEDs) signalling
- low self power consumption
- DIN bar mountable (optionally)
Application
- disconnector
- signalling of the battery voltage drops
- signalling of exceeding of the maximum voltage
- comparing relay controls one grade of the diode-element