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Model D4137
2 HP 110V Magnetic Switch
Instruction Sheet
Phone #: (360) 734-3482 • Online Tech Support: tech-support@shopfox.biz • Web: www.shopfox.biz
BLACK
GREEN
RED
COLOR KEY
Bk
Gn
Rd
YELLOW
3L2 5L3
13
NO
2T1
4T2
6T3
14
NO
TEST
TRIP IND.
97 NO
98 NO
95 NC
96 NC
2T1
4T2
6T3
O
R
54
NO
NO
53
ON
OFF
RESET
2 HP 110V Motor
110 Volt
Single-Phase
Power Source
M
A
1L1
TECO
CU-
16
Ground
Contactor TECO CU-16
(110V Coil)
Thermal Overload
Relay TECO RHN-10K
(22–30A)
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.
Figure 1. Model D4137 magnetic
switch.
Electrocution or
fire could occur if
this switch is not
installed or adjust-
ed by a qualified
electrician!