5
RANGE OF
PROTECTION
(AMPS)
RELAY PART
NUMBER
REQUIRED
MOUNTING PLATE
1.4 - 2.0 624728 622032
1.8 - 2.5 624729 622032
2.8 - 4.0 622034 622032
3.5 - 5.0 622075 622032
5.5 - 8.0 622031 622032
7.0 - 10.0 622077 622032
11.0 - 16.0 622082 622083
Table 4. Overload Relay Data
(3Ø Motor External Protectors)
EXTERNAL MOTOR OVERLOADS
Application
Siemens 3RU11 overload relays provide overload protection
for three-phase inductive motors with rated currents of up to
100A (75HP, AC-3, 480V). Most NORDYNE motors do not
require an external motor protector. Refer to Table 3 (page 4)
to determine which kits require protectors.
Auxiliary Contacts
The overload relays are equipped with a NC contact for de-
energizing the contactor and a NO contact for signalling an
overload trip. The breaking capacity of the switching contacts
is very high so that the contactor coils can be switched directly.
Trip Class
The 3RU11 overload relays are designed in accordance with
trip class 10 (e.g. The protector will trip in less than 10 seconds
at 6 times the trip current setting (FLA).
Phase Failure Sensitivity
A phase failure sensitivity function is integrated in to the relay
in order to provide increased protection in the event of a phase
failure, i.e. faster tripping in the event of a single-phase condition.
Setting the Overload Relay
The current setting dial can be accessed once the transparent,
sealable cover has been opened. The overload relay must be
set at the rated Service Factor Amps (SFA) of the motor for
the proper unit voltage. See Figure 2.
STOP Function
Pressing the red STOP button on the overload relay momentarily
opens the NC trip contact. No other contacts and/or functions
are affected by this STOP button.
Manual/Automatic Reset
The RESET button/mechanism features trip-free operation.
This means that the overload relay will trip on an overload
condition regardless of whether the reset button is pushed in
or not. Manual or automatic reset can be selected with the
blue button. The appropriate setting is selected by pressing
and turning the button. This setting can then be locked by the
sliding transparent cover.
TEST Function & Switch Position Indicator
The switch position indicator also incorporates a test function
which, when activated, simulates a tripped overload relay.
Both auxiliary contacts are actuated and the switch position
is indicated.
Overload Relay
Mounting Location
6 - 10 TON PACKAGED GAS / ELECTRIC CONTROL PANEL
(6 TON MODEL SHOWN)
6 - 10 TON PACKAGED AIR CONDITONER CONTROL PANEL
(6 TON MODEL SHOWN)
Overload Relay
Mounting Location
Overload Relay
Mounting Location
12.5 - 15 TON CONTROL PANEL
Figure 1. Overload Relay Mounting Locations
1. Equipment identifying marker
2. Manual/Automatic RESET selector switch
3. STOP button
4. Complete Catalog # on front of device
5. Switch position indicator and TEST function
6. Transparent cover, sealable (secures the current setting screw, TEST function
and manual/automatic RESET position)
7. Current setting dial
8. Terminal for contactor coil (when mounted on contactor)
9. Terminal for contactor aux. contacts (when mounted on contactor)
1
2
3
4
5
6
7
8
9
3RU111 OVERLOAD RELAYMOUNTING PLATE
Mounting
Hole
Mounting
Hole
Figure 2. Overload Relay & Mounting Plate
(12 pages)
(24 pages)
(60 pages)
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