Boardman CL Range of Transformers

CL Range Control Panel Transformers offering 230V with input tappings or 400V with input tappings. Designed and manufactured to comply with IEC61558.

This high quality product is manufactured using automated winding and welding machines; they offer good access to the four-hole fixing, touch-proof terminals and full varnish impregnation to protect against humidity.

Transformer Circuit Protection

Transformers must be protected against short circuit and overload.

Primary Circuit

The primary side of the Transformer should be protected against short circuit thereby cutting the supply voltage in the event of a short circuit fault. The rating of the primary protection device has to take into account the high inrush current during energizing of the Transformer. 

Secondary Circuit

The secondary circuit should be protected against short circuit and overload.

The value of the protection should be the same or less than the rated output current.

Power Rating Calculation

To choose the size of Transformer required for an application the total inrush VA must be calculated. This figure is then applied to the table above with the maximum allowable voltage drop taken into account. For example, for a calculated inrush of 2,100VA the appropriate transformer is as follows:

1. For 10% drop in output volts during inrush, choose 750 VA
2. For 5% drop in output volts during inrush, choose 1000 VA

Consideration must also be given to the continuous VA requirement.