NH40SZ Automatic Changeover Switch disconnector

Integrates electrical and mechanical interlocking systems to guarantee safe transfer operation.

It is applicable for the three-phase four-wire power supply system of AC 50Hz, rated voltage AC 380V, rated current up to 3150A.

It can realize automatic and manual changeover between normal and back up power supply power, and stop power supplying to load when changeover process of power supply is carried out.

The switch is applicable for two circuits power supply and in the condition which requires high quality power supply.

Standard: IEC 60947-6-1

Control characteristics:

There are two types of switch products, three-pole and four-pole (three poles + switchable neutral pole). Four control types (common type, I, Ⅱ,Ⅲ),usually it is common type.

Control characteristics of common type switch:

1. This switch applies to the automatic change and automatic recovery of main power supply-standby power supply (including manual oil generator; Note: Manual oil generator does not have to be used with type Ⅲ switches) systems. Power supply I precedes. When power supply I is normal, it is switched on; when power supply I fails and power supply Ⅱ is normal, the switch changes to power supply ; when power supply I resumes, the switch automatically changes to power supply I.

Control characteristics of type I switch:

a. This switch applies to the mutual standby of mains supply systems. When the switch is in the “0” position, power supply I precedes. When power supply I fails and power supply Ⅱ is normal, the switch changes to power supply Ⅱ; when power supply Ⅱ is on and power supply I resumes, the switch does not automatically change to power supply I, it will change to power supply I only when power supply II fails. The main power supply changes to the standby power supply (the delay continuously adjustable between 1～999s), the standby power supply changes to the main power supply (the delay continuously adjustble between 1～999s).

b. Phase loss detection protection function, overvoltage, undervoltage protection fuctions.

Control characteristics of type II switch:

a. This switch applies to the automatic change and automatic recovery of mains supply-mains supply systems. Power supply I precedes. When power supply I is normal, it is switched on; when power supply I fails and power supply II is normal, the switch changes to power supply II; when power supply I resumes, the switch automatically changes to power supply I. The main power supply changes to the standby power supply (the delay continuously adjustable between 1～999s), the standby power supply changes to the main power supply (the delay continuously adjustable between 1～999s).

b. Three-phase overvoltage, undervoltage and phase loss detection protection functions.

Control characteristics of type III switch:

a. This switch applies to the mutual standby or automatic change and automatic recovery of mains supply-oil generator (automatic oil generator with signals) systems. Power supply I (the mains supply) precedes. When power supply I fails, the switch gives a signal to start the oil generator. The oil generator has warm-up delay (continuously adjustable between 0～180s) function. After the oil generator has started, the switch changes to power supply II (the oil generator). When power supply I resumes, the switch automatically changes to power supply I, the oil generator automatically stops after a cooling delay (continuously adjustable between 0～180s).

b. Three-phase overvoltage and undervoltage protection functions for mains supply and oil generator.

Type I, type II and type III switches have:

1) Automatic, remote and manual control functions

2) A 0.5s delay of the detection signal, to prevent misoperation.

3) A remote control “0” position in automatic state.

4) A key switch for the selection of operation mode