Use and scope of application

NMSNA (B) series dual power automatic transfer switch is a new generation of automatic transfer switch developed by our company using microcomputer control technology. The switch uses the company's NS, C65 series circuit breakers as the actuator, and is equipped with a new type of control mechanism with electromechanical integration and electromechanical double interlocking. It is especially suitable for use in important power supply places where power supply is not allowed. In order to meet the needs of the site, the automatic transfer switch can realize three different working modes: self-returning, self-returning, and self-recovering.

NMSNA (B) series dual power automatic transfer switch is widely used in commercial and service departments to ensure power safety and production continuity, such as hospital operating room, high-rise building security system, computer room (bank, insurance company, etc.), shopping center lighting Systems, etc., and industrial continuous production lines, ship engine rooms, thermal power stations, port and railway systems, highway lighting systems, military resident control systems.

Model meaning

Note:

1. For non-standard products customers need to specify specific requirements, such as the form of fire signal (constant voltage DC24V pulse DC24V / constant voltage AC220V / pulse AC220V, the default value is constant voltage DC24V when not marked), passive feedback signal Type (position alarm), quantity (default is 1 set of position feedback signals).

2. If the customer has special requirements for the implementation of circuit breakers and trip units, additional instructions are required.

3. M type refers to manual type dual power transfer switch electrical appliances.

product features

▲ three optional working methods

Self-returning work

Self-returning

Mutual work

▲ three stable working positions

Common power supply, backup power supply

Common power supply and backup power supply

Common power supply, backup power supply

▲Usage category: AC33B, motor load or mixed load containing motor, resistive load and white light load below 30%.

▲Small size, simple structure, beautiful appearance, 1A-630A specifications, easy operation, long service life, 2 pole, 3 pole, 4 pole switch can be provided.

▲The switch switching drive adopts single motor drive, and the structure is simple and reliable, stable, no noise, and low impact force.

▲The switch has electromechanical interlock protection to ensure that the automatic transfer switch works reliably and does not interfere with each other.

▲The switch can automatically switch with load, and can be manually switched by the handle in case of emergency.

▲Compared with similar products of other companies;

The controller protection fuse has a breaking capacity of 50KA, which improves the safety of the distribution.

Interlocking is added between manual and automatic operation modes to ensure that manual operation is not possible under automatic conditions.

When the breaking handle is broken, the contact is bonded or the load is faulty (overload, short circuit), the automatic transfer switch does not switch, and the electromechanical interlock is realized.

▲ MCB type automatic transfer switch drive mechanism escapement is changed from fork type to concave type, which solves the faults such as MCB extended handle break and MCB closed unsynchronized.

The function of MCB speed combination and quick breaking is restored, which effectively improves the mechanical life of the product.

▲Provide the wrong line protection. When the user connects the power supply zero line and the fire line, it will be replaced by sound and light, which improves the reliability of the equipment.

Product feature explanation

A) Self-returning self-recovery: When the common power supply is normal, the controller issues a command, the common power supply control circuit breaker is combined, the standby power supply control circuit breaker is divided, and the automatic transfer switch electrical device is in the (1, 0) state. When the common power supply is abnormal, the controller issues an instruction, the common power control breaker is divided, the standby power control breaker is closed, and the automatic transfer switch appliance is in the (0, 1) state. When the common power supply returns to normal, the controller issues a command, the common power supply control circuit breaker is combined, the standby power supply control circuit breaker is divided, and the automatic transfer switch electrical device is in the (0, 1) state.

B) Self-recovery: When the common power supply is normal, the controller issues a command, the common power supply control circuit breaker is combined, the standby power supply control circuit breaker is divided, and the automatic transfer switch electrical device is in the (1, 0) state. When the common power supply is abnormal, the controller issues a command, the common power control circuit breaker is divided, the standby power control circuit breaker is closed, and the automatic transfer switch electrical power is in the (0, 1) state. When the common power supply returns to normal, the automatic transfer switch device still In the (0, 1) state, only the operation "reset" button can be used to make the common power control circuit breakers close, and the standby power control circuit breakers are divided, and the automatic transfer switch electrical appliances are turned back to the (1, 0) state.

C) Mutual backup: When the common power supply is normal, the controller issues a command, the common power supply control circuit breaker is combined, the standby power supply control circuit breaker is divided, and the automatic transfer switch electrical appliance is in the (1, 0) state. When the common power supply is abnormal, the controller issues an instruction, the common power supply control circuit breaker is divided, the standby power supply control circuit breaker is closed, and the automatic transfer switch electrical device is in the (0, 1) state. When the common power supply returns to normal, the automatic transfer switch appliance is still in the (0, 1) state, and only the standby power supply is cut off, so that the common power supply control breaker can be combined, the standby power supply control circuit breaker is divided, and the automatic transfer switch electrical appliance is turned back. (1,0) status.

D) Command (firefighting) reset (fire command is not): Regardless of the state of the automatic transfer switch, the fire center issues a non-instruction command to make the automatic switchgear common power control circuit breaker and backup power control circuit breaker all partial brakes. The switch is in the (0, 0) state.

E) Feedback signal: It reflects the signal of the two control circuit breakers of the automatic transfer switch electrical device. Generally, the signal is taken out from the auxiliary contact of the control circuit breaker.

F) Grid-to-grid: Automatic transfer switch electrical power is taken from two-way power supply.

G) Grid-generator: Automatic transfer switch electrical power source is taken from the grid power supply and generator.

H) The contact type automatic transfer switch device is composed of three molded case circuit breakers. Among them, QA and QB molded case circuit breakers are respectively supplied by two power sources or two sections of busbar power supply, and QC molded case circuit breakers are connected at the QA and QB output terminals. When any one of the power supplies fails, the circuit breaker is opened, the QC circuit breaker is closed, the circuit breaker is connected, and the power is supplied from the other power source. When the fault is eliminated, the contact circuit breaker is opened, and the faulty power circuit breaker is reclosed. The automatic transfer switch appliance resumes normal operation.

Outline mounting size