ZELK-3
Arc protection for a larger number of probes and non-selective or sectional configurations.
View detailsZELK-2 Arc Protection Device
Fast optical arc detection device with up to 6 optical probes and trip output without intentional delay.
ZELK-2 detects electric arcs in switchgear and activates the circuit breaker without intentional delay. Optical arc detection and a static trip element give a very short operating delay compared with the breaker opening time, helping detect the arc at its earliest stage and reduce possible damage in the installation.
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Sub-1 ms operation
The static trip element provides an operating delay below 1 ms.
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Up to 6 optical probes
Probes are installed in optically separated switchgear compartments and aimed at possible arc locations.
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Local fault indication
A numeric display shows and stores the number of the probe that detected the arc.
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Remote signalling
Loss of supply and protection operation are signalled remotely with one or two signalling relays, depending on the selected version.
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SM, IM and ZPM integration
In selective systems it can operate with the SM current module, IM trip module and breaker-failure protection module.
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DIN-rail mounting
Compact housing for mounting on a DIN EN 50022-35 rail or on a wall.
- Number of probes
- max. 6
- Probe cable length
- 4, 7 or 10 m; other lengths on request, maximum 20 m
- SM input
- galvanically isolated, 12 V / 20 mA
- Outputs for IM, ZPM and ZELK-2
- open collector, 12 V / 20 mA
- Trip current
- 10 A for 300 ms
- Minimum load current
- 5 mA
- Maximum voltage
- 600 V DC
- Rated voltage
- 220 V AC or DC
- Operating delay
- < 1 ms
- Remote signalling
- 1 or 2 signalling relays; 220 V AC, 300 V DC, 5 A; K1 NC, K2 NO contact
- Local signalling
- green power LED and numeric fault-location display
- Supply voltage
- 24, 48, 110 or 220 V DC +40% / -20%; or 220 V AC +10% / -20%
- Consumption
- standby 3.6 VA, max. 5 VA
- Operation after supply loss
- approx. 250 ms
- Temperature range
- -10...+55 °C
- Insulation
- 2.5 kV, 50 Hz, 1 min between all galvanically isolated circuits
- Mounting
- DIN EN 50022-35 rail or wall
- Dimensions
- 100 x 74 x 120 mm
Optical inputs
Electronic inputs and outputs
Trip element
Signalling
Power supply
General
- DIN EN 50022-35
- Insulation 2.5 kV, 50 Hz, 1 min
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