1. General

1.1 Selection

Technical data of the network at the point considered:

the earthing systems(TNS,TNC),short-circuit current at the circuit-breaker installation point,which must always be less than the breaking capacity of this device,Network normal votage.

Tripping curves:

B curve (3-5In)

protection for people and big length cables in TN and IT systems.

C curve (5-10In)

protection for resistive and inductive loads with low inrush current.

D curve (10-14In)

protection for circuits which supply loads with high inrush current at the circuit closing(LV/LV transformers, breakdown lamps).

1.2 Approvals and certificates

Detailed information, please refer to Certificates Tableon the last page.

P237

DZB65-63 Miniature Circuit Breaker

2. Technicl data

2.5 Temperature derating

The maximum permissible current in a circuit breaker depends on the ambient temperature where the circuit breaker is placed. Ambient temperature is the temperature inside the enclosure or switchboard in which the circuit breakers are installed.

The reference temperature is 30℃

When several simultaneously operating circuit breakers are mounted side by side in a small enclosure,the temperature rise inside the enclosure causes a reduction in current rating.

You must then assign the rating (already derated if necessary according to ambient temperatuer) a downrating factor of 0.8.

3. Overall and mounting dimensions (mm)