Eaton Digitrip 520 Instructional Leaflet page 33

Digitrip models 520, 520i; and 520M, 520Mi,
520MC, 520MCi trip units for use only in
Magnum and Magnum DS circuit breakers
Control
Voltage
d
Arcflash
Reduction
Maintenance
System Switch
a
b
c
a
Magnum Breaker (with MM wiring)
The Digitrip 520MC (Cat. #5ARMxxx) can locally be placed in Maintenance Mode via a two-position switch located on the trip unit. The function can also be armed via a remote switch as shown.
a
In addition, the function can also be activated via communications. A blue LED on the Digitrip verifies that Maintenance Mode is armed.
The recommended selector switch for this low voltage application is Eaton part number 10250T1333-2E, which includes a contact block rated for logic level and corrosive use.
b
The maximum length of this wiring to the remote Arcflash Reduction Maintenance System switch (or alternate relay contact) is 9.78 feet (3m). Use #20 AWG wire or larger.
c
Control voltage is 120 Vac or 230 Vac, or 24–48 Vdc or 125 Vdc. Check circuit breaker front cover for trip unit power requirements.
d
A remote stack light, annunciator panel, or other remote indication device can be connected to verify that the Digitrip is in Maintenance Mode.
e
Relay in GF Alarm/PS Module closes when Maintenance Mode is armed. Contact is rated 1A at 120 Vac or 0.5A at 230 Vac or 1A at 24–48 Vdc or 0.35A at 125 Vdc.
f
The Digitrip 520MC can also be placed remotely in its Maintenance Mode via a general purpose relay (ice cube type with logic level contacts) activated by a remote control switch.
g
A recommended type is IDEC Relay RY22. Choose voltage as desired.
Figurt 47. Mainotnanct MNdt Wiring—Digiorip 520MC
e
L
Communication wiring to IR MINT,
BIM, MODBUS MINT or PowerNet
computer. This can activate
Maintenance Mode if desired.
B1 B2
f
Instructional Leaflet IL70C1037H05
Remote
Indicator
(BlueLight)
eaton corporation www.eaton.com
Effective October 2009
Remote Arcflash
Reduction Maintenance
System Switch
g
g
c
A12 B7
Alternate Customer
Wiring (partial)
33