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Motor operating
mechanism
Closing solenoid (Y9)
Shunt release
Undervoltage release
Circuit-breaker
tripping signal
C.t-operated releases (Y6)
864-5091.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • Revision 06
The operating mechanisms of the 3AH49 vacuum circuit-breakers are suitable for auto-
reclosing. For DC operation, the maximum power consumption is approx. 500 W.
For AC operation, the maximum power consumption is approx. 650 VA.
The rated current of the motor protection equipment is shown in the following table:
Rated supply voltage [V]
DC 24
DC 48
DC 60
DC/AC 110
50/60 Hz
DC 220 / AC 230
50/60 Hz
*)
M.c.b. with C-characteristic
The supply voltage may deviate from the rated supply voltage specified in the table
by -15 % to +10 %.
The breaking capacity of the auxiliary switch 3SV92 is shown on the following table:
Breaking capacity
Operating voltage [V]
ac 40 to 60 Hz
up to 230
dc
24
48
60
110
220
The closing solenoid 3AY1510 closes the circuit-breaker. After completion of a closing
operation, the closing solenoid is de-energized internally. It is available for ac or dc voltage.
Power consumption: 140 W or 140 VA.
Shunt releases are used for automatic or deliberate tripping of circuit-breakers. They are
designed for connection to external voltage (dc or ac voltage). They can also be connected to
a voltage transformer for deliberate tripping.
Shunt releases based on two different principles are used:
• The shunt release (Y1) 3AY15 10 is used as standard in the basic circuit-breaker version.
With this design, the circuit-breaker is opened electrically.
Power consumption: 140 W or 140 VA.
• The shunt release (Y2) 3AY11 01 with energy store is fitted if more than one shunt release
is required. With this design, the electrical opening command is transferred magnetically
and thus, the circuit-breaker is opened. Power consumption: 70 W or 50 VA.
Undervoltage releases (Y7) 3AX1103 are tripped automatically through an electromagnet or
deliberately. The deliberate tripping of the undervoltage release generally takes place via an
NC contact in the tripping circuit or via an NO contact by short-circuiting the magnet coil.
With this type of tripping, the short-circuit current is limited by the built-in resistors. Power
consumption: 20 W or 20 VA.
When the circuit-breaker is tripped by a release (e.g., by protection tripping) there is a signal
through the NO contact -S6. If the circuit-breaker is tripped deliberately with the mechanical
pushbutton, this signal is suppressed by the NC contact -S7.
The following c.t.-operated releases are available:
• The c.t.-operated release 3AX1102 consists of an energy store, an un latching mechanism
and an electromagnetic system. Rated tripping current: 0.5 A/1 A
• The c.t.-operated release 3AX1104 (low-energy release) is adequate for a tripping pulse of
≤ 0.1 Ws in connection with adequate protection systems. It is used if auxiliary voltage is
missing, tripping via protection relay.
Recommended rated current for the protection
equipment* [A]
8
6
4
2
1,6
Normal current [A]
10
Resistive load
Inductive load
10
10
10
9
9
7
5
4
2,5
2
Description
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