Murphy Electronic Speed Switches are available in various configurations to cover a wide variety of applications.

These compact devices receive their input signal from various sources depending upon the particular speed switch model and application. They are available in single or dual switch point models, and the switch point(s) are field adjustable. Models are available in self-contained enclosures and as PC-board design for inclusion in your control cabinet. All Murphy speed switches are designed to operate in harsh environments and have high electrical noise immunity.

VS94 Series is an electro-mechanical device designed to protect equipment from damaging shock or vibration.

This sensitive mechanism can detect excessive shock or vibration and shut down the equipment before further damage occurs. A set of contacts is held in a latched position through a magnetic latch mechanism. As the level of shock or vibration increases, an inertia mass exerts force against the latch arm and forces it away from the magnetic latch causing the latch arm to separate and to operate the contacts. Sensitivity is obtained by adjusting the amount of air gap between the magnet and latch arm plate. The VS94 Series is housed in a NEMA 4/4X glass-filled polyester enclosure and has a base mount. It is for applications in non-hazardous locations. VS94 models are rated up to 480 VAC.

The VS2 Series switches are shock-sensitive mechanisms for shutdown of engine or electric motor powered equipment.

It is designed to detect shock/vibration in three planes of motion. These fully adjustable switches use a magnetic latch to ensure reliable operation. Explosion-proof EX models for hazardous locations are available. Ideal for use on engines, pumps, compressors, heat exchangers and pumping units, the VS2 Series can be used where shut-down protection from damaging shock/vibration is desired. Switches are field adjustable to the sensitivity required in each application.

A compact and economical pressure switch for extended duty applications. The 76.PS is primarily designed for direct engine mounting, to provide electrical signaling of a low oil pressure fault.

The isolated switch contacts are factory set to close below 15 psi (1 bar), but may be adjusted between 14 and 24 psi (1.0 and 1.6 bar). The polyimide diaphragm is compatible with air, engine oil and other hydrocarbon media. (Contact with waterbased fluids is not recommended.)

EMEA Region Only

A compact and economical pressure switch for extended duty applications. The 76.PS is primarily designed for direct engine mounting, to provide electrical signalling of a low oil pressure fault.

The isolated switch contacts are factory set to close below 15 psi (1 bar), but may be adjusted between 14 and 24 psi (1.0 and 1.6 bar). The polyimide diaphragm is compatible with air, engine oil and other hydrocarbon media. (Contact with waterbased fluids is not recommended.)

The TSB switch is a direct-mount switch for temperature sensing.

It has one limit contact that can be used to activate an alarm, actuate indicator lights or shut down equipment. The construction of this instrument is the same as our time-proven Swichgage^®. A precision machined brass mounting plate and port captures a high quality stamped beryllium copper diaphragm. The single-pole, double-throw (SPDT) snap-switch is operated directly from the diaphragm, for quick acting and positive switching. Trip point is factory preset according to your specifications. Housing is weather sealed to prevent entry of moisture, dust, etc. A glass-filled nylon terminal block with quick-screw terminal connections gives the TSB switch a real advantage in industrial engine applications. The TSB is ideal when reading is not desired but temperature is critical to operational efficiency. Intended for use in general purpose non-classified areas. Applications include: engine coolant, compressors, engine lubrication, mobile equipment, generators, irrigation systems, oil field systems, construction equipment, marine engines and electric motors.

The PSB switch is a direct-mount switch for critical pressure points.

It has one limit contact that can be used to activate an alarm, actuate indicator lights or shutdown equipment. The construction of this instrument is the same as Murphy’s time-proven Swichgage^® instrument. A precision machined brass mounting plate and port captures a high-quality, stamped beryllium copper diaphragm. The single-pole, double-throw (SPDT) snap-switch is operated directly from the diaphragm for quick acting and positive switching. Trip point is factory preset according to your specifications. Housing is weather sealed to prevent entry of moisture, dust, etc. A glass-filled nylon terminal block with screw terminal connections gives the PSB switch a real advantage in industrial engine applications. The PSB is ideal when reading is not desired, but pressure is critical to operational efficiency. Intended for use in general purpose non-classified areas.

Tattletale annunciators and magnetic switches are the nerve centers that translate Swichgage^® contact operations into decisions and operate the alarm or shutdown device.

These switches are the electrical load carrying devices for the alarm or shutdown device. Tattletale annunciators indicate which monitored function failed leading to the alarm or shutdown magnetic switches do not. Magnetic switches operate basically as a latching relay.