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
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