26
Air Circuit Breakers
BT2 series
○
Under-voltage release
▲
The under-voltage release consists of release coil and control unit;
▲
The under-voltage release operates in two ways: operate instantaneously and operate in
time delay;
▲
There are four specifications of time delay for the under-voltage time delay release: 0.5s, 1s,
2s and 3s. Users should consult with the manufacturer in the light of their order about special time-
delay specifications as from 3s and above up to 9s. The time delay accurary is
±
10%;
▲
The delay module should be additionally equipped for the under-voltage delay release. The
module input connects with the main circuit, and the output connects with the wiring terminals of 31
and 32 in the secondary circuit;
▲
If the voltage of power supply returns to 85% Us and above in half of the delay time, the
circuit breakers will not break. The module is stuck into the standard slideway of 35mm in width.
▲
Features
（
0.35
～
0.7
）
Us
（
0.85
～
1.1
）
Us
≤
0.35Us
12VA
AC400
Rated control supply voltage Us
（
V
）
AC230
Operational Voltage
（
V
）
Reliable Switching-on Voltage
（
V
）
Reliable Switching-on Resistant Voltage
（
V
）
Power Consumption
·
69
·
Delay Module of Under-voltage
delay release for BT2-1600
In connection with the main circuit
In connection with the terminals of
31 and 32 in the secondary circuit
Under-voltageTime-delayModule
AC230V
INPUT
For BT2-1600 Circuit Breaker
13.0 ACCESSORIES
BT2 with frame current of 2000A and above
Fuju Electric FA
0.5s
1s
2s
3s
OUTPUT
input
output
Accessories
BT2-2000 and above
Current transformer with neutral line N connected
externally
• This current transformer, which is used together with circuit
breakers with three poles in the power distribution system
of TN-S, installed in the neutral line N with 2m at maximum
far from the installation point.
• Characteristics
Electrical mechanism for the indication of draw-out
socket's position
• When the main body of the draw-out circuit breaker and
the draw-out socket are at the position of “separated”, “test”
and “connected” respectively, three electrical mechanisms
for the indication of draw-out socket's location can output
the electrical signals corresponding with three positions
above respectively. These mechanisms are installed inside
the draw-out socket.
• Characteristics
Electrical module for indication of ready-for-switching-
on
• This electrical module indicates that the ciruit breaker is
ready for switching-on.
• Characteristics
Rated working voltage
Ue (V) 230
Convertional thermal current
Ith (A) 10
Rated working current
Ie (A) 1.5
Rated working voltage
Ue (V) 230
Convertional thermal current
Ith (A) 10
Rated working current
Ie (A) 1.5
Rated working voltage
Ue (V) AC400
AC230
Acting voltage
(V) (0.35~0.7) Us
Reliable switching voltage
(V) (0.85~1.1) Us
Reliable switching resistant voltage
(V)
≤
0.35Us
Power consumption
12VA
Note: In the electrified metworks where thunder and rain often happens or whose
power supply is not stable, under-voltage release with time delay is highly
recommended to protect the circuit breader from releasing due to transient
voltage-lowering. Generally, delay time, which is selective by users , is 0.5s,
1s, 2s and 3s.
•
Steel cable interlocked
The style of interlock of three circuit breakers see the style of
interlock between two sets of circuit breakers. The maximal
distance of two circuit breakers is 2m.
Wiring diagram
Possible operation pattern
Pattern three:Two sets of power supply plus a
piece of coupling busbar
