40
Magnum PXR accessories
MAGNUM PXR PRODUCT GUIDE
PA013006EN September 2022 www.eaton.com
4
Spring release (SR) and latch check switch (LCS)
The spring release is an optional device. It remotely closes
the circuit breaker when the coil is energized by a voltage
input. The closing spring must be fully charged, and the
trip latch reset (not held in the tripped position) for the
spring release to operate. If these two conditions are not
met, the close signal will be ignored until it is removed
and re-applied.
An optional Latch Check Switch (LCS) can be installed to
indicate when the breaker is “ready to close.” The LCS
wired to the spring release will not permit activation of the
spring release until the breaker is fully charged and the
trip latch is reset. If power is applied and maintained to
the spring release, activation will occur when the breaker
is “ready to close.” This wiring is done internally to the
breaker and does not require any additional wiring at the
secondaries.
The LCS for remote indication consists of one form C
contact wired to the circuit breaker secondary contacts for
integration into external control schemes.
ote:
N
Wiring the LCS for remote indication directly in
series with the SR accessory is not recommended,
as this will override the “antipump” feature of the
electrical charging/closing system.
ote:
N
Do not use a monitoring circuit on a spring release.
Table 13. Spring release ratings
Control
voltages
Operational
volagte range
85-110%
Inrush/
continuous
power
consumption
Opening
time (ms)
Kit catalog
number
24 Vdc
20-26 Vdc
250 W
40
MSRC
48 Vdc
41-53 Vdc
250 W
40
MSRH
60 Vdc
51-66 Vdc
300 W
40
MSRS
110-125 Vdc
93-138 Vdc
450 W
40
MSRA
220-250 Vdc
187-275 Vdc
450 W
40
MSRR
110-127 Vac
93-140 Vac
450 VA
40
MSRA
208-240 Vac
177-264 Vac
450 VA
40
MSRR
Figure 41. Shunt trip
Figure 42. Shunt trip installed
Figure 43. Spring release