Siemens SENTRON 3WL10 - Basic Unit; Product and Mounting Versions

The tripping time T
p
for motor protection has its reference point at7.2xIr while the delay
time t
r
for plant protection has the reference point at6xI
r
. For this reason, the delay time t
r
and tripping time T
p
are not identical.
2.8 Basic unit
2.8.1 Product and mounting versions
Product versions of 3WL10 air circuit breakers
• Air circuit breaker with a stored energy operating mechanism
• Switch disconnector with a stored energy operating mechanism
Product versions of 3VA27 molded case circuit breakers
• Molded case circuit breaker acc. to IEC60947-2
• Non-automatic air circuit breaker acc. to IEC60947-3 and IEC60947-2 Annex L, CBI-Y
Operator versions of 3VA27 molded case circuit breakers:
• Toggle operating mechanism
Conventional front operation of the circuit breaker via toggle, optionally expandable with
manual operators (direct operators and door mounted rotary operators)
• Stored energy operating mechanism
Front operation via a pushbutton with an integrated spring energy store, as for the air circuit
breakers, for optional integration of spring charging motors that charge the spring energy
store
Mounting versions of 3WL10 and 3VA27 circuit breakers
The following two mounting versions are available:
• Fixed-mounted
In the case of 󹪝xed-mounted breakers, the circuit breaker is permanently installed in the
switchboard panel.
• Withdrawable
The withdrawable breaker comprises a 󹪝xed part (guide frame) and a movable part (circuit
breaker). This permits fast disconnection of the circuit breaker from the power system for
quick replacement or for maintenance without disassembly work and thus ensures high
availability of the installation.
Description
2.8Basic unit
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
30 Equipment Manual, 10/2023, L1V30499596002-03