MODEL 28

Is designed for rapid response to changes in surface temperature. The bimetal is mounted in intimate contact with a copper base providing optimum heat transfer. Satisfies military environmental specifications in many critical applications. Gold plating inhibits oxidation of the sensing surface. The adjustment screw is solder sealed in factory calibration. Mounting is with #4 screws for 2 holes at 1.031" centers. Weight is .216 oz. U.S. Patent No. 2.991.341. Supplied with a tin finish as the MODEL 28NP which has its adjustment screw glyptal or solder sealed.
SIZE: 1-5/16" L. x .400" W x 9/16" H.
RATING: 5A. 115 V.A.C. or 28 VD.C.

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MODEL 219

Has identical construction to the model 28 with exception of the copper right angle mounting bracket This bracket reduces the mounting height by 7/32" without sacrificing the rapid thermal response of the Model 28. Gold plating is standard Provided with 4 mounting holes having .125" diameters and 1.000" centers. Weight is .264 oz. Designated as the MODEL 219NP with a tin finish.
SIZE: 1-5/16" L. x .375" W x 9/16" H.
RATING: 5A. 115 VAC. or 28 VD.C.

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MODEL 237

Has identical construction to the Model 28 except that the copper mounting base is circular. Gold plating is standard. Provided with 2 mounting holes with 7/64" diameters and .578" centers. Designated as the MODEL 237NP with a tin finish.
SIZE: 3/4" diameter x 9/16" H.
RATING: 5A. 115 VA.C. or 28 VD.C.

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MODEL 32

Has internal construction similar to the Model 28 except that its 3-element construction switch is mounted on a common terminal post. Supplied with either a gold or tin finish.
SIZE: .750" L, x .334"W x 19/32" H.
RATING: 5A. 115 VA.C. or 28 VD.C.

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MODEL 374

Has a stainless steel tubular probe for immersion applications. Its 3-element switch construction is identical to the Model 28. Tin finish is standard. Supplied with a standard 1/8" NPT stainless steel fitting. The probe is 1/4" diameter by 1-11/16" long.
SIZE: 2-25/32" L x 7/8" W
RATING: 5A. 115 V.A.C. or 28 V.D.C.

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MODEL 440

Operates on the principle of thermal differential expansion between two dissimilar metals. The stainless steel thermal probe is 1/4" diameter by 1-23/32" long. It is supplied with 1/8" NPT or a 7/16"-20 UNF stainless steel fitting. Contact arrangement is normally closed only. Designed for critical military and aerospace applications. Tin finish is standard.
SIZE: 2-27/32" L.x 7/8" W
RATING: 5A. 115 V.A.C. or 28 V.A.C.

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MODEL 184A

Has a bimetal element securely fastened to a solder type terminal support sealed in a compression type header. Ground terminal lug speeds soldering of lead wire. Supplied with a single terminal lug as the Model 184. With factory calibration, adjustment screw is solder sealed. Gold plating is standard. Weight is .100 oz U.S. Patent #3,294,940
SIZE: 1/4" diameter x 1.219" L.
RATING: 1A. 115 V.A.C. or 28 V.D.C

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MODEL 185A

Is not influenced by the heating generated in the bimetal element since the contact spring shunts the load current from the bimetal. This serves to reduce calibration drift. The second terminal composite with the tubular housing facilitates soldering of lead wire. Supplied with a single terminal lug as the

Model 185

Gold plating is standard. With factory calibration, adjustment screw is solder sealed. Weight is .125 oz.
SIZE: 1/4" diameter x 1.260" L.
RATING: 1A. 115 VA.C. or 28 V.D.C.

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MODEL 284

Has both hermetically sealed glass terminals insulated from the housing. The bifurcated stud assembly insures a rigid anchorage of the elements and speeds heat transfer from the exposed terminal to the bimetal Both heads are mechanically crimped into the housing before sealing to eliminate dependence upon solder for its mechanical structure. Gold plating is standard. With factory calibration, adjustment screw is solder sealed. Weight is .175 oz.
SIZE: 1/4" diameter x 1.675" L
RATING: 1A 115 V.A.C. or 28 V.D.C.

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