Termal-Manyetik Devre Kesiciler

Çalışma Mantığı

Normal Load Operation

Thermal (Inverse Time) Trip Mechanism.

The thermal trip mechanism operates in response to overload conditions. The mechanism includes a bimetal element located behind the trip bar. The bimetal element is part of the current-carrying path. When there is an overload, the increased current flow heats the bimetal and causes it to bend. As the bimetal bends, it touches and rotates the trip bar causing the circuit breaker to trip. The time needed for the bimetal to bend and trip the circuit breaker varies inversely with the current.

Short Circuit Operation

Magnetic (Instantaneous) Trip Mechanism.

The magnetic trip mechanism operates when there is a high current (short circuit) in the current path. The mechanism includes an electromagnet and an armature. When high-level current passes through the conductor, the magnetic field strength of the electromagnet rapidly increases and attracts the armature. As the top of the armature is drawn to the electromagnet, the armature rotates the trip bar causing the circuit breaker to trip.

Özellikler:

  • The Fuchs-type thermal-magnetic circuit breakers are ideal for upstream cascading breaker systems.
  • Thermal-magnetic breakers can be mounted in any position. The tripping characteristic does not change.
  • Magnetic only tripping circuit breakers are available, ideally suitable for motor short circuit protection.
  • Specially designed breakers for class 2 coordination with contactors and overload relays.

Triple Pole Circuit Breakers (Mixed Load)

Type Poles Terminals kA@ No. of Interphase Barriers Rating (A)
415 V 525 V
G15D 3 G1 15 15 2 16, 20, 32, 40, 50, 63
G1 15 15 80, 100
G1 15 15 125
F15D 3 G1 15 15 4 150, 160
G1 15 15 175, 200, 225
G4B 15 15 250
G25D 3 G1 25 18 2 16, 20, 32, 40, 50, 63
G1 25 18 80, 100
G1 25 18 125
F25D 3 G1 25 22 4 150, 160
G1 25 22 175, 200, 225
G4B 25 22 250
G35D 3 G1 35 22 2 16, 20, 32, 40, 50, 63
G1 35 22 80, 100
F35D 3 G1 35 22 4 125
G1 35 30 150, 160
G1 35 30 175, 200, 225
G4B 35 30 250
F65DV 3 G1 65 35 4 20-25, 32-40, 45-63
G1 65 35 70-100
G1 65 35 90-125
G1 65 35 125-160
G4B 65 35 175-250

KD Circuit Breakers (Mixed Load)

Type Poles Terminal k@ No. of Interphase Barriers Rating (A)
415 V 500 V 525 V
K25D 3 G4B 25 22 - 4 250
3 G4B 25 22 - 4 300, 350, 400
K35D 3 G4B 35 30 30 4 250
3 G4B 35 30 30 4 300, 350, 400
3 G4B 36 22 - 4 500, 630
K50D 3 G4B 50 40 35 4 500, 630

KDE Electronic Circuit Breakers (Adjustable)

Type Poles Terminal k@ No. of Interphase Barriers Rating (A)
415 V 500 V 525 V
K35DE 3 G4B 35 30 30 4 200-400
K50DE 3 G4B 50 40 35 4 300-630
K65DE 3 G4B 65 50 50 4 200-400
K70DE 3 G4B 70 50 - 4 300-630

Triple Pole Circuit Breakers (Mixed Load) Electronic Adjustable

Type Poles Terminals kA@ No. of Interphase Barriers Rating (A)
415 V 500 V
N83DE 3 G4B 85++ 65++ 2 500-1000
3 2 600-1250
3 2 800-1600

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