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Instructions
Hazardous voltage.
Can cause death, serious injury, or
property damage.
Disconnect power before working on this
equipment.
INSTALLATION:
There are mounting hole locations in the housing of the overload
so that it may be directly attached to a mounting panel or over-
load backplate (when replacing an existing unit on a starter).
Use all of the mounting locations to prevent vibration and/or
breakage of the housing during use.
48AS (A, B, D) Three Phase Models:
48AS (A, B, D, E) Single Phase Models:
(To use as a separately mounted overload)
Proper installation requires that the line side motor leads be con-
nected to the terminal block mounted on the top of the over-
load. Load side motor leads should then be connected to the
terminals at the bottom of the overload. Torque all connections
to 20 lbs.-in. maximum. A typical control wiring diagram is
shown in Fig. 5 and a typical power wiring diagram is shown in
Fig. 3 & 4.
(To use as a replacement overload or on a starter kit)
To use as a replacement overload for a motor starter or for instal-
lation on a starter kit, the terminal block must be removed from
the top of the overload. loosen the line side terminal screws and
then the two small mounting screws until the block can be
pulled from the overload. There should be three exposed line
side terminals (see Fig. 4). These terminals are to be inserted
under the contactor load side terminal screws. Torque connec-
tions to 20 lbs.-in.. maximum. Mount the overload to the starter
backplate, using all mounting locations.Torque mounting screws
15 lbs.-in. to 20 lbs.-in.
Adjustment Cap Removal (Optional):
After the FLA has been selected, remove the gray adjustment
cap to deter unwanted tampering with the setting. Pull the
adjustment cap tab (with pliers) directly away from the face of
the overload as seen in Fig. 6. To reinstall the cap later, line up
the arrow on the cap with the setting mark on the red disc and
push into place. The setting can now be changed.
48AS (E, F, G) Three Phase Models:
These overloads can be used as a separately mounted overload
or as a replacement overload. These overloads are not con-
nected to the motor branch circuits in any way. Proper installa-
tion simply requires that the motor leads be passed through the
"windows" in the overload relay (Fig. 3), and the normally
closed contact be wired in to the control circuit. A typical wiring
diagram is shown in Fig. 5.
APPLICATIONS:
Class 48 overload relays are suitable for use with 50 or 60 Hz
three phase motors and have an operating range from -22I F to
+159I F(-30I C to +70I C). The motor voltage can exceed 600V,
but the control circuit contact is rated NEMA A600 and NEMA
P600 (10A continuous, 600VAC maximum and 5A continuous,
600 VDC maximum).
Siemens Energy & Automation, Inc. 3333 Old Milton Parkway Alpharetta, GA 30005
Figure 3
TYPICAL WIRING DIAGRAM
DIMENSIONS (Solid-State Overload)
48AS (A, B, D) Three Phase & (A, B, D, E) Single Phase
48AS (E, F, G) Three Phase
48-HASA3M
November, 2003
Supersedes March, 2000
Figure 4
Figure 5
Figure 6
Page 2
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