1.2.2 Connection Terminals

All terminal blocks for secondary circuit are of spring-clamped type without screws. Terminals at least enable the single wire in 2.5 mm2 cross section easily connected. The terminals used for power incoming/ outgoing cables whose cross section > 6 mm2 will be screw fastening type. 1.2.3 Measuring indicators

Measuring indicators are provided in standard DIN 43700/IEC 61554 sizes 96x96 mm and 72x72 mm (or 48x48mm) for starters , with black frame, white scale background, black pointers (rotating angle 90 ), black text and red-mark on nominal value. The precision class is of 1.5 and the scale of the indicators normally has the following measuring range:

0 ~120 % of rated voltage - Voltmeter - Ammeter - Watt-meter

0 ~130 % of rated current (over-current withstanding type for starters) -15 % (reverse) to approx. 130 % of rated wattage

- Frequency meter 55-60-65 Hz (alternatively 45-50-55Hz)

1.2.4 Air Circuit Breakers (ACB’s)

Three-pole Air Circuit Breakers (630A~6300A, frame size current) may be used as power incoming breakers, outgoing feeders or bus-ties, in fixed or withdraw-able type. Manual operation of the breakers (by operating handle) is possible from the front. The electrical motorised operation can be furnished, particularly for remote controlled power incoming breakers or bus-ties. The ACB’s are equipped with electronic releases which can be configured with adjustable long time over-current inverse time trip, short time delay trip, and electromagnetic instantaneous trip for short current.

The flexibility for adding accessories such as microprocessor-controlled over current release, shunt releases, under-volt releases, lock and interlocks, etc. creates a lot of possibilities for tailoring the system to fit a wide range of applications. The actual configuration of ACB’s is defined hereinafter

Scope of Supply.

1.2.5 Molded Case Circuit Breakers (MCCB’s)

Above pictures show three different brands of ACBs mounted in our switchboards.

Three-pole Molded Case Circuit Breakers (100A~1600A, frame size current) may be designed as power incoming breakers, outgoing feeders or bus-ties in fixed, plug-in or withdraw-able type. Normally for outgoing feeder breakers, the operation is achieved manually by means of rocker arm on its front if no otherwise specified. The electrical motorised operation can be furnished, particularly for remote controlled power incoming breakers.