Murphy VS2 User Manual

VS-96013B page 1 of 4

VS2 Series

■

Designed to Detect Shock/Vibration
in 3-Planes of Motion

■

Fully Adjustable

■

Includes Magnetic Latching Feature

■

Manual or Electric Reset

Description

The VS2 Series switches are shock sensitive
mechanisms for shutdown of engine or elec­tric motor powered equipment. These
switches use a magnetic latch to ensure reli­able operation. Explosion-proof “EX” mod­els for hazardous locations are available.

Applications

Ideal for use on engines, pumps, compres­sors, heat exchangers and pumping units, the
VS2 Series can be used anywhere shutdown
protection from damaging shock/vibration is
desired. Switches are field adjustable to sen­sitivity required in each application.

Specifications

VS2 and VS2C
Case: Equal to NEMA 3R. Suitable for

non-hazardous areas.
VS2: Base mount
VS2C: C-clamp mount, includes 45 ft. (13.7 m)

2-conductor cable, and 5 cable clamps.

Contacts: SPDT-double make leaf contacts,

5A @ 480 VAC.

VS2EX
Case: Base mount, explosion-proof aluminum

alloy housing; meets NEMA 7/IP50 specifi­cations; Class I, Division 1, Groups C & D;
UL and CSA listed.*

Snap-switches: 2-SPDT snap-switches; 5A

@ 480 VAC;* 2A resistive, 1A inductive,
up to 30 VDC.

Normal Operating Temperature: -40 to

140°F (-40 to 60°C).

VS2EXR
Case: Same as VS2EX.

Snap-switch: 1-SPDT snap-switch and reset

coil; 5A @ 480 VAC;* 2A resistive, 1A
inductive, up to 30 VDC.

Remote Reset : 115 VAC or 24 VDC (specify).

VS2EXRB
Case: Explosion-proof aluminum alloy

housing; rated Class I, Division 1, Group
B hazardous areas.

Snap-switch: 1-SPDT snap-switch with

reset coil (option available for 2-SPDT
switches); 5A @ 480 VAC; 2A resistive,
1A inductive, up to 30 VDC.

Remote Reset: 115 VAC or 24 VDC (specify).

Basic Operation

Pushing the reset button moves the tripping
latch into a magnetically held position.
A shock/vibration will move the magnet
beyond this holding position, thus freeing
the spring loaded tripping latch to transfer
the contacts and shutdown the machinery
(see dimensional diagrams in the following
pages for visual representation of parts).

Remote Reset Option
(VS2EXR and VS2EXRB)

The remote reset option includes a built­in electric solenoid which allows reset of
tripped unit from a remote location.
Available for 115 VAC or 24 VDC.

Warranty

A limited warranty on materials and workmanship
is given with this FW Murphy product. A copy of
the warranty may be viewed or printed by going to
www.fwmurphy.com/support/warranty.htm

VS2EX

VS2

*CSA and UL listed with 480 VAC rating.

LISTED

*

VS-96013B

Revised 09-08

Catalog Section 20

00-02-0076

Shock and Vibration Switch

VS-96013B page 2 of 4

ELECTRICAL

Contact Rating:

5 A @ 480 VAC

VS2 and VS2C

VS2EX

• NEMA 7/IP50 Specifications

• Snap-switch Contacts

• TATTLETALE

®

Reset Button

The VS2 and VS2C are designed for use in non-hazardous loca­tions. They have leaf type SPDT, double make contacts that can
be used for shutdown and/or alarm. They have a slotted sensitivity
adjustment located on the side of the case (see drawing below).

Model VS2EX is housed in an explosion-proof enclosure with
threaded cover. This enclosure is CSA and UL listed for Class I,
Division 1, Groups C & D hazardous locations. In place of the
leaf type contacts, 2-SPDT snap-switches are used in this model.
Sensitivity is externally adjustable and, when tripped, the VS2EX
gives a TATTLTALE

®

indication on the reset button. It is con-

structed to meet NEMA 7 specifications.

ELECTRICAL

Contact Rating:

5 A @ 125–480 VAC
1/2 A @ 125 VDC
1/4 A @ 250 VDC
2 A Resistive 30 VDC
1 A Inductive 30 VDC

2-SPDT Switches (DPDT)

NO1

COM

NO2NC

4-11/16 in.

(119 mm)

5-3/8 in.

(137 mm)

VS2C Model

SIDE VIEW FRONT VIEW

Air Gap

3-1/8 in.
(80 mm)

2-1/4 in.
(57 mm)

Permanent
Magnet

Reset
Push
Button

Mounting

Bracket

C-clamp

Mounting

Bracket

VS2C Model

(Cover removed)

NO1 NC COM NO2

5-1/8 in. (130 mm)

Mounting Holes

4-40 NC
Screw
Terminal

Permanent
Magnet

TATTLETALE
Reset Push
Button

Air Gap

(10 mm)

4-11/16 in.

(119 mm)

3/8 in.

4 places

Adjustment
Armature

Slotted Sensitivity
Adjustment

1/2 Conduit
Threads

Weatherproof
Strain Relief
Bushing (VS2C)

1/4 x 1/2 in.

(6 mm x 13 mm)

Slot 2 places

5-5/8 in. (143 mm)

3 in.

(76 mm)

Mounting

Holes

5-1/4 in.

®

NC NO COM

NC NO

COM

TOP VIEW

(Cover removed)

(133 mm)

Mounting

Holes

6-3/8 in.

(162 mm)

COM

N.C.N.O.

COM

N.C.N.O.

1/2 NPT

Conduit

4-7/8 in.

(124 mm)

(44 mm)

1-3/4 in.

SIDE VIEW

Slotted
Sensitivity

Adjustment

MORE

SENSITIVE

LESS
SENSITIVE