4303 - Eutectic Temperature Switch

Features

 Protects stationary bearings and other parts from damage due to unsafe high temperature levels.

● EXPLOSION PROOF (Rating Pending)

● NO RECALIBRATION REQUIRED (Acceptable to MMS)

● SPRING LOADED DESIGN

● LARGE TEMPERATURE SENSING AREA

● FIELD REPLACEABLE SENSOR

● ENVIRONMENTALLY SEALED UL/CSA LISTED MICRO SWITCH

Applications

● HIGH BEARING AND FLUID TEMPERATURE DETECTION

●POWER OR COMPRESSOR CYLINDER OVERLOAD

● HIGH PACKING GLAND TEMPERATURE DETECTION

● HIGH DISCHARGE TEMPERATURE DETECTION

Operation

AMOT Model 4303 Temperature Switches provide a low cost, reliable sensor which will initiate a warning or shut-down upon a sudden temperature rise in critical machine parts. Such temperatures may arise from tight, worn or out-of- round bearings, tight packing glands, cracked or broken shafts, torsional vibration, cylinder overload, lack of lubricant and many other sources. Model 4303 Switches may be used in medium to large stationary bearings and can be applied to liquid systems by installing them in a 6721L Well. For similar capabilities in moving bearing applications, refer to AMOT's Model 4102 Temperature Detectors.

Model 4303 has a stainless steel body containing a normally open or normally closed switch. The temperature sensing portion of the 4303 is a thin film of eutectic alloy located near the tip of the Fuse Rod Assembly. This eutectic alloy, less than 0.001 cubic inch in volume, secures a spring loaded fuse rod until the temperature at the sensing end of the rod melts the alloy. The fuse rod is then instantly released and allows the spring-loaded rod to close or open the contacts.

PATENTED EUTECTIC ALLOY

Patented eutectic alloy temperature sensor features permanent calibration, no periodic checking required.

REPLACEABLE TEMPERATURE SENSOR

The eutectic alloy fuse rod assembly can be easily replaced in the field.

Specifications

Body Material.....................................416 Stainless Steel
Switch Body Lock Nut...................................Plated Steel
Sensor..................................................Brass / Aluminum
Adaptor.................................................Zinc Plated Steel Wells.................................416 Stainless Steel (all types)
Maximum Ambient..................................................300°F
Net Weight.............................................0.5 lbs. (0.23 kg)
Wire Type....................Shielded 4 Conductor, 20 Gauge, Teflon ª insulated with Teflon ª Jacket

Internal Micro
...Switch Contact Arrangement......................................SPDT
...Design Temperature.............................-65° to 400°F
...UL / CSA Listed Gold Contacts......................................1A @ 125Vac
...Silver Contacts....................................7A @ 250Vac

Switch Approvals
...Explosion Proof: CSA, Class 1, Div. 1 Groups B, C & D (Listing Pending)
...Suitable for Div. 1 hazardous area installation with Intrinsically Safe Circuits (I.S.)