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KZR-8Sxx Short-Circuit Relay

The KZR-8Sxx* Short-Circuit Relay monitors the current in three-phase networks. It is equipped with 2 limit value relays, whose response values can be set independently of each other, ranging from 0.2 A to 20 A for the 5A variant and from 0.04 A to 4 A for the 1A variant. Separate delay times and switching behaviours are adjustable for each limit value. Current is measured via current transformers.
The current measurement circuits are galvanically separated from each other and from the other electronics. Suitable current transformers are to be provided for adapting to the measurement circuits. The protective device is available in the variants KZR-8S and KZR-8SA (with analogue output - no galvanic isolation).
* The designation KZR-8Sxx is sustitutionally used for all available variants of the short circuit relay KZR-8S.

Special feature: The threshold relay 1 can operate as a current-depended delayed overload relay. This behaviour is modelled on the thermal / temporal overload triggering of motor circuit breakers. The KZR-8Sxx meets the VDE 0108 requirement with 110 % nominal current within a 12-hour interval. This current-dependent overload trigger can be switched off, resp. combined.
Use the current version of the downloadable parameterisation software for setting the device parameters.


pdf data sheet (english)

pdf description (english)

pdf data sheet (german)

pdf description (german)

pdf software

Technical Data

Auxiliary voltage
9 ... 34V DC

Power consumption
approx. 3 VA

Delay time
adjustable: 0.1 ... 100 s
systematic 50 ms + tx +/- 50 ms for t>0

< 0.01 Ohm

Relay outputs
230 V / 50 Hz / 2 A

Ambient temperature
-20 ... +55 ºC

Error (nominal frequency)
< 1%

Measuring inputs
10*Inom 1 ms

Overload resistance
4*Inom continuous

Type of protection

W / H / D : 100 x 75 x 110 mm
(35 mm standard rail)

Additionally for KZR-8SA:
Analogue output
12 Bit
≥ 1 kOhm
Internal resolution
besser als 0,5 %
Refresh rate
approx. 200/s
Output voltage
max. 10,7 V

Ordering information:
KZR-8S / 5A / 12-24V : E1463
KZR-8S / 1A / 12-24V : E1464

KZR-8SA / 5A / 12-24V : E1465
KZR-8SA / 1A / 12-24V : E1466

USB cable (USB-A : B Mini) : KC0215