Eaton MDN-408 Instructions For Installation, Operation And Maintenance page 56

Instruction Book
Page 47 Effective: May 2006
Spring Release - The spring release is an optional
device (Figure 3-50). It remotely closes the circuit
breaker when the coil is energized by a voltage input
(Table 3.4). The closing spring must be fully charged
and the trip latch reset (not held in the tripped position)
for the SR 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 circuit breaker is "ready to close".
Two versions of the LCS are available.
The Latch Check Switch wired to the Spring Release
will not permit activation of the Spring Release until the
circuit breaker is fully charged and the trip latch is reset
(Figure 3-50). If power is applied and maintained to the
Spring Release, an activation will occur when the cir-
cuit breaker is "ready to close".
The Latch Check Switch for Remote Indication consists
of 1 Form C contact wired to the circuit breaker sec-
ondary contacts for integration into external control
schemes. Note that wiring the LCS for Remote
Indication directly in series with the SR accessory is not
recommended as this will override the "anti-pump" fea-
ture of the electrical charging/closing system.
Figure 3-50 Spring Release with Optional Latch Switch
Table 3.4 Spring Release Ratings
Operational
Control Voltage Range
Voltages 70-110%
24 Vdc 17-26 Vdc
48 Vdc 34-53 Vdc
110-125 Vdc 77-138 Vdc
220-250 Vdc 154-275 Vdc
110-127 Vac 77-140 Vac
208-240 Vac 146-264 Vac
①
Required for less than 200 ms
①
Closing
Inrush Power Time
Consumption (ms)
250 W 40
250 W 40
450 W 40
450 W 40
450 VA 40
450 VA 40
For more information visit: www.EatonElectrical.com
Undervoltage Release - The undervoltage release is
an optional device on both manually and electrically
operated circuit breakers (Figure 3-51). It opens the cir-
cuit breaker when its supply voltage falls to between 35-
60% of rated voltage. If the release is not energized to
85% of its supply voltage, the circuit breaker cannot be
closed electrically or manually (Table 3.5).
Auxiliary Switch - An auxiliary switch is an optional
device providing remote electrical indication if the circuit
breaker is open or closed (Figure 3-53). Up to 3 auxil-
iary switches can be mounted in the circuit breaker.
Each switch has 2 normally open ("a") and 2 normally
closed ("b") contacts for a total of 12 available contacts
(Table 3.6).
Figure 3-51 Undervoltage Release
Figure 3-52 Shunt Trip, Spring Release and
Undervoltage Release Installed
I .B. 2C12060H08