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Mercoid Controls Series
M-51 		Bi-metal Air Temperature Switches
Double adjustable, heavy duty, universal mounting, automatic reset
ULCE


Designed for use as a limit switch, fan control, or alarm switch, Model M-51 is used on all types of air conditioning ducts, furnaces, ovens, dryers, etc. Unit may also be used with damper control system to prevent spread of fire through ducts. Adjustments for both set and reset points. Visible dial shows duct temperature and switch set points.

FEATURES
  • U.L. listed
  • Automatic or manual reset
  • SPST mercury switch (SPDT switches available)
  • Visible dial shows duct temperature
  • Two adjustments: one sets high temperature set point, the other sets low temperature reset


PHYSICAL DATA
Max. Ambient Temperature:   180°F.
Max. Bi-Metal Temperature:   See chart.
Mounting:   Reversible flange for flat or curved surfaces.
Dial Calibration:   Degrees F.
Housing:   Steel with glass fronted cover.
Electrical rating:   10A @ 120V; 5A@ 240V. AC/DC. Motor rating: 120V/240V AC. Single phase, 3/4 Hp,120/240 D.C 1/2 Hp. (SPST mercury switch).
Weight:   5 lbs.

Model
Number
Switch Action
on Temperature Rise
Adjustable
Range, °F
Minimum
Deadband
Dim. A
Reset
M-51-71
M-51R-71
M-51-74
M-51R-74*
 		Opens
Opens
Opens
Opens
 		25-125
25-125
50-500
50-500
 		12°F
12°F
20°F
20°F
 		5 3/8"
5 3/8"
4 3/8"
4 3/8"
Automatic
Manual
Automatic
Manual
*This model also FM approved


SUGGESTED SPECIFICATIONS
Temperature switch shall be direct acting bimetal type with fully adjustable set and reset points. Switch shall have visible dial and shall indicate duct temperature and switch settings. Dial shall be calibrated in degrees F. Switch shall be U.L. listed. Switch shall be Mercoid Model No. M-51_____.



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