Siemens AC-3 Datasheet download pdf (Page 45)

Motor Protection Circuit Breakers

3VU13 and 3VU16

3VU13/3VU16 is suitable for use in fuseless motor feeders upto 11KW/22KW (25A/63A) respectively. 3VU

motor protection circuit breakers are used for protection of motor against overload, single phasing and

short-circuit faults.

Applications

• Motor Protection

Circuit breakers type 3VU13 & 3VU16 offer overload, short

circuit and phase loss protection for 3 phase motors upto 11kW

and 22 kW respectively. The breaker has a toggle switch for

ease of operation and can be offered with auxiliary contacts,

trip indicating contacts, U/V or Shunt release. High breaking

capacity of 100kA is available in 3VU13 upto 6A and in 3VU16

upto 25A.

• Distribution Feeder Protection

Standard version of 3VU13 and 3VU16 has adjustable O/L and

fixed S/C release. Main application is for disconnection and

protection of the distribution feeders, upto 25A and 63A

respectively. A large number of overlapping ranges are

available for offering closer protection to various loads.

• Transformer protection

A separate 3VU13 range can be offered to protect the primary

side of the transformers. The range is available upto 20A. To

take care of the inrush current due to transformer switching,

the S/C release is set at 19 times the rated current unlike 12

times of the rated current available in standard range.

• Fuse Monitoring

3VU1340-1MS00 is offered for Fuse Monitoring application.

This device is connected in parallel to the fuses. In case one of

the fuses blows, the rated current will flow through the

corresponding phase of this MPCB. MPCB, through its auxiliary

contacts, provides a tripping signal to the contactor and thus

the motor will be switched off. Hence, the motor will be

protected from single phasing. (Refer page 51 for connection

diagram)

Standard

3VU motor protection circuit breakers confirm to IS/IEC 60947-1,

IS/IEC 60947-2, IS/IEC 60947-4-1, DIN VDE 0660

Range

3VU13: 0.16 - 25A

3VU16: 10 - 63A

Benefits and features

High performance

• Instantaneous Tripping

3VU circuit breakers operate on the Current Limiting

Principle.

Current Limiting Principle

In case of short-circuit condition motor protection circuit

breaker trips before the short-circuit current reaches the

prospective peak. Hence, for circuit breaker to be current

limiting it must interrupt the short-circuit current in half cycle

or less as shown below.

3VU13/16

Fuse Monitoring MPCB - 3VU1340-1MS00

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 71 72

Comments to this Manuals

No comments

Siemens AC-3 Datasheet Page 45

Comments to this Manuals

Related products and manuals for Network switches Siemens AC-3