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4. Equipment
The basic version of the 3AF 01 vacuum circuit-breaker
comprises:
– Manually operated stored-energy mechanism for
closing
– Electrical operating mechanism ..................... (M1)
with anti-pumping feature
– Shunt closing release ...................................... (Y9)
– 1st shunt release ............................................ (Y1)
– Auxiliary switch 5NO+5NC or 11NO+11NC ..... (S1)
– Operating cycle counter
– Mechanical ON-OFF & spring charge indicators
Each 3AF 01 vacuum circuit-breaker can be equipped
with the following supplementary devices:
– Position switch for signalling
"Closing spring charged" ................................. (S4)
– 2nd shunt release 3AY 1510 ........................... (Y3)
– Suppl. shunt release 3AX 1101 ....................... (Y2)
– Current transformer-operated
release 3AX 1102 ............................................ (Y4)
– Undervoltage release 3AX 1103 ...................... (Y7)
– Non return valve
The permissible combinations of supplementary
equipment and special versions are stated in Table 4.
4.1
Operating Mechanism (Fig. 11)
The operating mechanism is of the stored energy type,
i.e. the charging of the closing spring is not automatically
followed by the contacts changing position.
When the stored-energy mechanism has been charged,
the instant of operation can be chosen as desired.
A distinction is made between hand operating and motor
operating mechanisms, the actual stored-energy
mechanism being the same in both cases.
The mechanical energy for carrying out an 'OFF-ON-OFF"
sequence is stored in the closing and tripping springs.
4.2
Closing
Motor-operated mechanism (M1) with stored-energy
mechanism (P-2, Fig. 11):-
The stored-energy mechanism of the circuit-breaker is
available with a motor-operated mechanism, including
shunt closing release. The motor-operated mechanism
starts operating immediately once the power supply has
been connected with the closing spring initially in
discharged state. The motor is automatically de-
energized internally after charging the closing spring.
Manual operation can also be performed at any time. The
closing spring is charged by inserting the hand crank in
the opening (P. 15, Fig. 11) until the "spring charged"
indication appears and an audible clicking noise indicates
that the closing pawl has latched. It is then possible to
close the breaker either manually or electrically. After
closing, the spring can be recharged manually.
The maximum DC power input is 770 W (approx.) The
maximum AC power input is 900 VA (approx.). During
part of the short spring charging time, the motors
operate in the overload range.
The supply voltage of the motor-operated mechanism
may deviate from the rated value by -15% to +10%.
4.3
Shunt releases
4.3.1
Shunt closing release (Y9) 3AY1510
(P-4, Fig. 11).
The closing solenoid unlatches the charged closing
spring and thus closes the circuit-breaker electrically. It is
available for both AC and DC operations. The closing
solenoid is not designed for continuous operation and it
is de-energized internally. The supply voltage of the
closing solenoid may deviate from the rated value by
-15% to +10%.
Power consumption: approx. 200 W/VA
4.3.2
1st shunt release (Y1) 3AY1510 (P-5, Fig. 11)
The 3AY1510 shunt release is used as standard in the
basic circuit-breaker version. With the Y1 release, the
electrically supplied tripping pulse is passed to the
"Open" latching mechanism by means of a direct-action
solenoid armature and the circuit-breaker is thus opened.
This opening solenoid is not designed for continuous
operation and it is de-energized internally. The supply
voltage of the shunt release may deviate from the rated
value by -30% to + 10% with DC voltage; by -15% to +
10% with AC voltage.
Power consumption: approx. 200 W/VA
4.3.3
2nd shunt release (Y3) 3AY15 10
(optional feature)
This release is used if more than one shunt release is
required to ensure opening of the breaker in case of
failure of first shunt release. The voltage of this release
hence can be same or different than first shun release.
This release is dimensionally & functionally same as first
shunt release (Y1)
Power consumption: approx. 200 W/ VA
4.3.4
Suppl.shunt release (Y2) 3AX1101
(optional feature)
The 3AX1101 shunt release is fitted if more than one
shunt release is required. With this design, the electrical
opening command is transferred in boosted form to the
"Open" latching mechanism via a solenoid armature
through unlatching of an energy store and the circuit-
breaker is thus opened. This opening solenoid is not
designed for continuous operation and it is de-energized
internally.
Power consumption: approx. 60 W/ 100 VA
4.3.5
Under voltage release (Y7) 3AX1103
(optional feature)
Undervoltage release consist of a stored-energy
mechanism, an unlatching mechanism and an
electromagnet system which is connected continuously
to the supply when the circuit-breaker is in the close
state. if this voltage drops to below certain value, the
7
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