Commissioning

DANGER

Open transformer circuits lead to electric shock and arc flashover!

Disregarding this will result in death, physical injury or considerable damage to property!

Never open the secondary circuit of the current transformer under load.
Short-circuit the secondary current terminals of the current transformer before removing the device.

WARNING

Hazardous voltage can lead to electric shock and burns!

Make sure that the details on the name plate and in the "Technical data" correspond to the operating parameters of the system.
Switch the system off before commencing with the installation!

WARNING

Induction of high voltages into the secondary circuit!

If the secondary circuit of the current transformer is not under load (open), high voltages are induced on its secondary terminals. The voltage values occurring there represent a danger to persons and the functional safety of the current transformer.
"Open operation", i.e. operation of the current transformer without secondary wiring, must be avoided at all costs.

Make sure that the working environment is safe during assembly, maintenance and installation work. Interrupt the power supply of the primary conductor and secure against being switched on again inadvertently.
Install the current transformer on the primary conductor.
To do this, feed the primary conductor (copper bar or round conductor) through the window aperture of the current transformer housing. The window aperture is marked with "K-P1" or "L-P2" respectively.
The device can be fastened directly to the primary conductor or alternatively to a mounting plate. Use the fastening materials included in the scope of delivery for this.
Direct fastening to the primary conductor is done by screwing the fastening screws included in the accessories pack into the screw bosses on the transformer housing or with the optionally available quick-fix cable fastening (ZB8203-0210/ZB8203-0211).
Mounting on a mounting plate takes place with the base brackets also included in the accessories pack.
Current transformers of the types SCT21xx and SCT22xx can also be fastened to 35 mm DIN rails by means of a snap-on mounting (ZB8201-0210), which is available as an accessory.
Make the secondary connections. Observe the markings "k-S1" and "l-S2" of the secondary terminals.

Measuring circuit

	SCT21xx	SCT22xx	SCT23xx	SCT24xx	SCT25xx	SCT26xx
Dimension "A" [mm]	40	40	65	65	95	95