V122
V122
Nelson Enclosures & Controls
Vibration Switches - Class 531
Use:
• The Nelson Vibration Switch is a safety
device designed for protecting rotating
machinery, such as motors, generators,
engines, pumps and fan, from abnormal
levels of vibration. If the vibration level of such
a device becomes excessive, the switch will
trip, shutting down the device being protected.
• The switch operates on the principle of
magnetic air gap, an increased air gap for
low vibration and decreased air gap for high
vibration levels.
• The sensitivity (air gap) can be adjusted by
means of an adjustment knob and lock nut on
the outside of the enclosure. Rotation of the
knob changes the sensitivity of the switch. A
satisfactory adjustment can be achieved by
trial and error, locating the switch where it is
subjected to maximum vibration.
Features:
• Two SPDT micro switches.
• External sensitivity adjustment.
• Manual reset button.
• Standard "O-Ring provides watertight seal
for NEMA 4 application.
Material/Finishes:
• Copper-free cast aluminum enclosure.
• Grey epoxy power coat.
Switch Contacts
COM
NC NO
COM
NC NO
Class 531 Vibration Switch
Switch Rating:
15A at 125, 250, or 480 VAC
1
⁄2A at 125 VDC
1
⁄4A at 250 VDC
1
⁄8 HP - 125 VAC, 1⁄4 HP - 250 VAC
VIBRATION SWITCH ASSEMBLIES
Area Classification
Class I, Groups C, D
Class I, Zone 1, Group IIB
Class II, Groups E, F, G
Class I, Groups B, C, D
Class I, Zone 1, Group IIB + Hydrogen
Class II, Groups E, F, G
Catalog Number
TBSM
TBSM-B
Applicable Third Party Standards:
UL Standard 698
Third Party Certification:
Type TBSM
UL Listed: E-75434
R
CSA Certified: LR50996
Type TBSM-B
UL Listed: E-75434
Compliances:
Type TBSM
Class I, Div. 1, 2, Groups C, D
Class I, Zone 1, 2, Group IIA, IIB
Class II, Div. 1, 2, Groups E, F, G
Class III
NEMA 4, 7CD, 9EFG
Type TBSM-B
Class I, Div. 1, 2, Groups B, C, D
Class I, Zone 1, 2, Group IIA, IIB+H2
Class II, Div. 1, 2, Groups E, F, G
Class III
NEMA 4, 7BCD, 9EFG
To Order Specify:
Class Number
Catalog Number
Effective December, 2007
Copyright 2007
800-621-1506
www.o-zgedney.com
V123
V123
Nelson Enclosures & Controls
Vibration Switches - Class 531
Dimensional Data:
Side View
Front View Less Cover
Performance Curves:
Frequency-Hertz
Plane A (1)
Typical Wiring Diagrams:
Vibration switch used with magnetic motor starter:
Frequency-Hertz
Plane B (1)
(1) Data compiled by use of sine wave vibration table.
*Opens when tripped
+Closes when tripped
Vibration switch used with
gasoline engine magnetos:
Vibration switch used with engine distributor system:
Effective December, 2007
Copyright 2007
800-621-1506
www.o-zgedney.com