Eaton NRX Series - Section 1: General Information

2
Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
EATON CORPORATION www.eaton.com
Instruction Leaet IL01301010E
effective January 2013
Section 1: General information
Spring release (SR)
A spring release is recommended for electrically operated circuit
breakers, although it is an optional device (Figure 1). It remotely
closes the circuit breaker when the coil is energized by a voltage input.
When a latch check switch is installed, 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 (Table 1).
Figure 1. Spring Release
Latch check switch (LCS)
A latch check switch indicates when the circuit breaker is “ready to
close” (Figure 2 and Table 2).Two versions of the LCS are available:
1. Internal—The LCS 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. The LCS is supplied with two
leads and a small 2-pin connector.
2. External—The LCS used for remote indication consists of one
Form C contact wired to the circuit breaker secondary contacts for
integration into external control schemes.
Note: Wiring the LCS for remote indication directly in series with the SR
accessory is not recommended as this will override the “anti-pump” feature. The
LCS is supplied with three leads and two secondary connectors.
Figure 2.
External LCS
Internal LCS
Latch Check Switches
Table 1. Latch Check Ratings
Control Voltage Frequency Contact Rating (Amperes)
250 50–60 Hz 10
125 DC 0.5
250 DC 0.25
Note: Many illustrations use the NF Frame 1600A circuit breaker for illustrative
purposes only. The RF Frame 4000A circuit breaker is handled in a similar
fashion.
Table 2. Spring Release Ratings
Control Voltage Frequency
Operational Voltage (Range
85–110%)
Inrush Power Consumption
(VA) Closing Time (ms)
24 DC 20–26 400 25
48 DC 41–53 500 25
60 DC 51-66 500 25
110–127 50–60 Hz 94–140 750 25
110–125 DC 94–138 750 25
208–240 50–60 Hz 177–264 800 25
220–250 DC 187–275 800 25