Quick Facts
- monitoring: in 3-phase systems
- "MEMORY" function - manual reset function, press "RESET" button
- HRN-43 - for 3x400V circuits (without neutral conductor)
- HRN-43N - for 3x400/230V circuits (with neutral conductor)
- 2 output relays, function of the 2nd relay selectable (independent / parallel)
- fixed (t1) and adjustable (t2) delay to avoid short-term failures and peaks
- galvanic isolated supply AC 400V, AC 230V, AC/DC 24V
The relay is used for monitoring 3-phase systems. HRN-43N monitors the voltage to the neutral conductor, HRN-43 monitors the voltage between phases. The relay monitors and checks: Voltage in 2 levels (over-/undervoltage), phase asymmetry, phase sequence and phase failure. Each fault state is indicated by its own LED. By means of DIP switch (no. 3) it is possible to determine the function of the second relay - whether it works independently (1x overvoltage, 1x undervoltage) or in parallel. Delay t1 (fixed) - during transition from fault state to normal state or during voltage failure and t2 (adjustable) - during transition from normal state to fault state. The delays prevent line faults and flicker in the output at short-term peaks in the network.
Voltage check
The upper level Umax is set in the range 138-276V (or 240-480V for type HRN-43) and the lower level Umin in the range 35-99% of the Umax. If a phase deviates from the set range, the output relay switches off after the set delay (which prevents short-term voltage peaks). The output relay contact switches on again when the voltage lies again within the set range and exceeds the fixed hysteresis (which can be set in 2 levels by DIP switches).
Phase sequence
Checks the correct phase sequence. If an undesired change is made, the output contact is switched off; if the device is switched on with an incorrect phase sequence, the output contact is always switched off.
Asymmetry
The asymmetry part between the individual phases is set in the range 5-20%. If the set asymmetry is exceeded, the output relay contact switches off and the LED indicating the asymmetry lights up. Delay t1 and t2 and hysteresis take effect during the transition to the normal state.
Electrical Data
| Operating voltage | AC 110 V, AC 230 V, AC 400 V or AC/DC 24 V (AC 50-60Hz) |
| Power consumption | max. 4.5 VA |
| Switching output | 250 V AC1 / 24 V DC |
| Mechanical life | 3 x 10^7 |
| Connection | screw terminals 2.5mm² |
| Max. ambient temperature | -20°C to +55°C |
| Storage temperature | -30°C to +70°C |
| Protection class | IP40 |
| Voltage limitation class | III |
| Pollution degree | 2 |
