Siemens Industry, Inc. 5300 Triangle Parkway, Norcross, GA 30092
E87010-A0519-T003-A7-3RE4
Instructions
Installation
Operation
Maintenance
Replacement
March, 2019
A5E46948882A-002
3RE4
Non-Combination Motor
Controllers
For replacement parts information or an application guide,
visit our website at www.usa.siemens.com/controls,
or contact your local Siemens sales office.
s
IMPORTANT
These instructions do not purport to cover all details or variations in equipment, nor to
provide for every possible contingency to be met in connection with installation,
operation or maintenance, should further information be desired, or should particular
problems arise which are not covered sufficiently for the purchaser’s purposes, the
matter should be referred to the local Siemens sales office. The content of this
instruction manual shall not become part of or modify any prior or existing agreement,
commitment or relationship. The sales contract contains the entire obligation of
Siemens. The warranty contained in the contract between the parties is the sole
warranty of Siemens. Any statements contained herein do not create new warranties
or modify the existing warranty.
Hazardous Voltage.
Will cause death or serious injury.
Turn off and lock out all power supplying
this device before working on this device.
Replace all covers before power
supplying this device is turned on.
DANGER
Description
3RE4 non-combination motor controllers include a
horsepower rated contactor and an overload relay
(OLR) with a reset operator (for motor starters).
They may also include optional factory installed
accessories such as pilot devices and a control
power transformer.
The NEMA Type 1 enclosures have a lift-off cover.
They are suited for general purpose indoor applica-
tions only.
The NEMA Type 3/3R/4/12 enclosures have a
removable hinged door. They are water and dust
tight and are suited for outdoor as well as indoor
applications.
The NEMA Type 4X 304 stainless steel enclosures
are noncorrosive and have a removable hinged
door. They are water and dust tight and are suited
for outdoor as well as indoor applications.
Pre-Installation
1. Examine the enclosure and each component for
shipping damage. Notify carrier for a claim if any
damage is found. DO NOT attempt to install or
apply power to any damaged product.
2. Verify that the horsepower, voltage and current
rating of the motor do not exceed the controller
rating.
3. If the control circuit is to be powered by an
external source, verify that the supply voltage
matches the voltage rating of the contactor coil.
4. If a control power transformer is supplied with
the controller, verify that the supply voltage
matches the primary voltage of the control
power transformer.
5. For controllers other than size S2 starters, skip
this step and proceed to the next one. Size S2
starters are shipped with the OLR uncoupled
from the contactor. This is to help prevent
damage should the product be mishandled
during shipment. The OLR must be coupled to
the contactor by following these steps:
a. Couple the OLR to the contactor as
shown in Figure 1.
b. A jumper wire should already be
connected to terminal A2 on the contactor.
Route the loose end of the wire between
the contactor and OLR as shown in
Figure 2.
c. Connect the loose end of the wire to
terminal 95 on the OLR.
1
E87010-A0519-T003-A7-3RE4
Page 2
Installation
General Maintenance
Siemens Industry, Inc. 5300 Triangle Parkway, Norcross, GA 30092 A5E46948882A-002
Install in accordance with the National Electrical Code in
the United States, or Canadian Electrical Code in
Canada, and any applicable local codes.
1. If the enclosure has a hinged door, the enclosure may be
fastened directly to a solid mounting surface via the four
mounting feet, which are included. All four mounting feet
must be attached to the enclosure using the supplied
hardware to retain the NEMA rating of the enclosure.
Follow the instructions included with the mounting feet.
If the enclosure has a lift-off cover, the enclosure must be
fastened directly to a solid mounting surface via the
mounting holes in the back of the enclosure.
Mounting hardware is not included and any suitable
hardware may be used.
2. If the NEMA Type 3/3R/4/12 enclosure is to be used as a
Type 3R enclosure, drill a 1/8" – 1/4" diameter drain hole
at the lowest point in the bottom of the enclosure.
3. Turn off and lock out the power that will be supplying the
controller.
4. Install conduit and necessary grounding means and wire
controller in accordance with the wiring diagram included
with the controller. Conduit knockouts are provided on the
enclosures with lift-off covers. For the hinged enclosures,
use UL Listed conduit hubs with the same NEMA Type
rating as the enclosure. Joint compound or equivalent is
recommended on conduit threads to prevent water from
entering the enclosure.
5. Check that all wiring is secure and does not interfere with
proper operation of any device.
6. Check that all wiring connections, including factory
connections are proper and tightened to the proper torque
values.
7. Remove all foreign materials and debris from enclosure.
8. For thermal OLRs, set the MANUAL / AUTO switch and
FLA dial as shown in Figure 3a. For solid-state OLRs, set
the Trip Class dial, MANUAL / AUTO switch and FLA dial
as shown in Figure 3b. For more information, refer to the
OLR instruction sheet. The publication number may be
found on the side of the device.
9. Depress the OLR Reset button to make sure the OLR is
not tripped.
10. Close and fully latch the cover / door before applying
power.
11. If a local selector switch is installed, make sure it is in the
OFF position.
12. Apply power and turn the controller on. The contactor
should energize. If it does not energize, troubleshoot the
controller to locate the issue.
Periodically conduct the following inspection and
maintenance tasks.
1. Clean the inside of the enclosure by wiping off
dust and dirt which may have accumulated.
2. Clean weep hole in bottom of NEMA Type 3R
enclosure to insure proper drainage.
3. Check all screws for tightness.
4. Refer to the OLR instruction sheet for
instructions on optional device tests.
Figure 1
(Typical for both thermal and solid-state OLRs)
E87010-A0519-T003-A7-3RE4
Page 3
Siemens Industry, Inc. 5300 Triangle Parkway, Norcross, GA 30092 A5E46948882A-002
Figure 2
(Typical for both thermal and solid-state OLRs)
Figure 3a
Thermal OLR
E87010-A0519-T003-A7-3RE4
Page 4
Siemens Industry, Inc. 5300 Triangle Parkway, Norcross, GA 30092 A5E46948882A-002
Figure 3b
Solid State OLR
Contactor & OLR power connection type / torque
S00: Screw / 7 – 10 lb.-in.
S0: Screw / 18 – 21 lb.-in.
S2: Box lug / 26 - 39 lb.-in.
Contactor & OLR power connection solid & stranded
conductors
S00: 2x (20 - 16), 2x (18 - 14), 2x 12 75°C CU
S0: 2x (16 - 12), 2x (14 - 8) 75°C CU
S2: 2x (18 - 2), 1x (18 - 1) 75°C CU
Coil connection type / torque
Screw / 7 - 10 lb.-in
Coil solid & stranded conductors
2x (20 - 16), 2x (18 - 14), 2x 12 CU 75°C
Contactor auxiliary contact connection type / torque
Screw / 7 - 10 lb.-in
Contactor auxiliary contact solid & stranded conductors
2x (20 - 16), 2x (18 - 14), 2x 12 CU 75°C
OLR auxiliary contact connection type / torque
Screw / 7 - 10 lb.-in
OLR auxiliary contact solid & stranded conductors
Thermal: 2x (20 ... 16), 2x (18 ... 14) CU 75°C
Solid-State: 1x (20 - 14), 2x (20 - 14) CU 75°C
Wire Type and Connection Torque Specifications
Replacement Parts
Description
Part Number
Contactor parts (Obtain Cat. No. from device and refer to Industrial Control Catalog.)
-
OLR parts (Obtain Cat. No. from device and refer to Industrial Control Catalog.)
-
OLR reset operator for all NEMA Type enclosures
49MBRS
Mounting feet for hinged enclosures (four feet per pack)
*Saginaw SCE-ELJMFK
* Part is not sold by Siemens and must be purchased from a third-party supplier.
