Eaton NRX Serie Installationsanleitung Seite 2

Instruction Leaflet 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.
Table 2. Spring Release Ratings
Control Voltage Frequency
24 DC
48 DC
60 DC
110–127 50–60 Hz
110–125 DC
208–240 50–60 Hz
220–250 DC
2 EATON CORPORATION www.eaton.com
Figure 2.
Table 1. Latch Check Ratings
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.
Operational Voltage (Range
85–110%)
20–26
41–53
51-66
94–140
94–138
177–264
187–275
Installation and Removal Instructions
for Series NRX Spring Release, Latch
Check Switch and Motor Operator
Internal LCS
Latch Check Switches
Control Voltage Frequency
250 50–60 Hz
125 DC
250 DC
Inrush Power Consumption
(VA)
400
500
500
750
750
800
800
External LCS
Contact Rating (Amperes)
10
0.5
0.25
Closing Time (ms)
25
25
25
25
25
25
25