Section 20 00-02-0185
2016-05-16 - 1 -
General Information
Description
The FW Murphy shock and vibration switches are available in a variety of models. They are
used for applications on machinery or equipment where excessive vibration or shock can
damage the equipment or otherwise pose a threat to proper operation. A set of contacts is held
in a latched position through a mechanical latch and magnet mechanism. As the level of
vibration or shock increases, inertia mass exerts force against the latch arm and forces it away
from the magnetic latch. This action causes the latch arm to operate the contacts. Sensitivity is
obtained by adjusting the size of the air gap between the magnet and the latch arm plate.
Applications include all types of rotating or reciprocating machinery such a cooling fan, engine,
pump, compressors, pump jacks, etc.
Models
VS2: Base mount; non-hazardous locations. VS2 and VS2C are IP54 rated (when
mounted on a horizontal surface with the drain holes down).
VS2C: C-clamp mount; non-hazardous locations.
VS2EX: Explosion-proof; Class I, Div. 1, Groups C and D (CSA and UL approved).
VS2EX and VS2EXR are IP54 rated.
VS2EXR: Explosion-proof with remote reset (CSA and UL approved).
VS2EXRB: Explosion-proof; Class I, Div.1, Group B: with remote reset (no third-party
approval for this product). No IP rating for this product.
VS94: Base mount; non-hazardous locations, NEMA 4X/IP66.
Remote Reset Feature (VS2EXR, VS2EXRB and VS94 only)
Include built-in electric solenoid which allows reset of tripped unit from a remote location.
Standard on models VS2EXR and VS2ERB. Optional on VS94 (options listed below).
R15: Remote reset for 115 VAC
R24: Remote reset for 24 VDC
Time-Delay Option (VS94 only)
Overrides trip operation on startup. For VS94 series models, the delay time is field adjustable
from 5 seconds up to 100 seconds with a 20-turn potentiometer (5 seconds per turn
approximately). Options listed below:
T15: Time delay for 115 VAC
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