Model D4137
2 HP 110V Magnetic Switch
Instruction Sheet
110 Volt
Single-Phase
Power Source
Electrocution or
fire could occur if
this switch is not
installed or adjust-
ed by a qualified
electrician!
1L1
3L2
5L3 13NO
NO
53
TECO
Contactor TECO CU-16
(110V Coil)
Ground
ON
NO
CU-
16
54
COLOR KEY
14NO
6T3
2T1
4T2
Bk
BLACK
Gn
GREEN
Rd
RED
YELLOW
TRIP IND.
M
A
O R
TEST
RESET
OFF
Thermal Overload
Relay TECO RHN-10K
(22–30A)
98 NO
95 NC
96 NC
97 NO
2T1
6T3
4T2
Figure 1. Model D4137 magnetic
switch.
2 HP 110V Motor
IMPORTANT: This magnetic switch toggles a motor ON and OFF, and helps provide thermal overload
protection for the motor if the operating temperature gradually increases due to heavy work loads. The
thermal overload relay inside is not designed to cut power in the event of a sudden motor overload or
stall. To help protect a motor from this type of overload, the power supply circuit must be properly
sized for the full-load current rating of the motor.
OPERATION: When pushed, the green ON button on the outside cover of the magnetic switch allows
current to flow to the magnetic coil, which pulls the contactor closed. The main current then passes
through the thermal overload relay to the motor. If the motor begins to overheat, the relay breaks the
magnetic field, which opens the contactor and cuts current to the motor. The red OFF button manually
breaks the magnetic field, which opens the contactor and disconnects the current to the motor.
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