The arc detecting relay is connected to light sensitive detectors suitable placed in the various cubicles or drawers inside the switchboard. the overcurrent relay is used if overcurrent as well as an arc has to be present before the supply circuit breaker is tripped. However, arcing time is hereby increased.
The time relay is an extra security. It is design to trip a back-up breaker further back in the supply with a time delay, if both an arc and an overcurrent are present after tripping of the supply breaker.

The relay can monitor up to 16 arc detectors in parallel. In case of an arcing fault, the relay generates a fast tripping pulse to the circuit breaker(s) supplying the installation. The delay is less than 1 mSec. The arcing time is thus reduced to the mechanical opening time of the circuit breaker, reducing personal injury as well as damage of the installation. The relay is solid state with complete isolation between input and output. Thus the relay and the circuit breaker may have different pilot voltages. In TEST-position the relay can be tested without circuit breaker tripping. The relay has 2 free signal contacts: One contact is for remote indication of arcing fault trip. The other contact indicates absence of pilot voltage - or that the TEST-function is activated. The sensitivity to light (bias current) is adjustable within 1-12 mA on the front plate

The unit is designed to connect up to 8 detectors in parallel and has a separate indication of which detector(s) caused tripping by means of a red LED for each detector. The red LED is lit when the light intensity exceeds 6.000 lux. on the detector, but it turns off again if the intensity goes below 6.000 lux. At 12.000 lux. the arc detecting relay is triggered, the active LED’s are latched and a yellow LED (TRIP) is turned  on. All LED’s remain turned on until reset by a common RESET button. Max. 2 boxes per arc detecting relay is allowed.

For connection of up to 8 detectors in parallel. No indication.

React on light and is available with 180º or 360º charac­teristic. To be installed in each cubicle/drawer and should be shielded from normal switching arcs. Detectors are supplied with 5 m of cable and a mounting bracket.

A 3-phase current relay to be used in combination with a DC arc detecting relay. The current setting range is 1.5-3.0xIn (7.5-15A). Each time the set current is exceeded a red LED (TRIP) turns on and an output relay activates. The relay contact - normally closed - opens and cancels the blocking of the arc detecting relay making it able to trip the supply breaker in the case of an arcing fault. The function of the arc detecting relay is thus made dependent on the current at the time of the arcing fault. However arcing time is increased.

The relay is used in combination with junction box 601D0400. (601D0500 cannot be used). The relay is completely solid state and has complete isolation between detector input and output. In TEST-mode all functions of the system can be tested without tripping the breaker. The relay has energy stored in a storage capacitor charged with a DC voltage to trip the circuit breaker. The relay has 2 free signal contacts: One contact is for external indication of tripping on arcing fault. The other contact indicates absence of pilot voltage - or that the TEST-function is activated. Both contacts are activated after tripping as the relay normally disconnects its own supply voltage. The sensitivity to light (bias current) is adjustable within 1-12 mA on the front plate.