The Fail-Safe Switch is used in all Unimax interlocks,available in one, two and three pole units as standard with larger switch banks availble upon request these positive-break, fail-safe, load switching controls maybe purchased without any additional hardware.

 

 

 

 

 

 

 

 The switch components are housed in a Zytel flame retardant nylon 66/6 Copolymer with 25% glass reinforced case (compliant with UL94V-0). The large heavy-duty contacts are mounted on an actutor which is directly driven by a cam.The contacts open to a 4mm air gap, in compliance with VDE and other main isolation standards .Switches are rated 25A 250AC Manufacturer's rating UL / CSA approval 15A 480V AC.

 Fail-safe features: The contacts are forced open by positive cam action. If the contacts weld the secondary contacts open and a shearing action then breaks the weld. Should a spring break, the contacts would still open, the design prevents any short-circuiting by a spring fragment.

INDEXED CAM SHOULDER SWITCH

Indexed Cam fail safe switches are equipped with a mounting collar drilled for two blind roll pins used to lock the switch in place with 3 operating positions 60 degrees apart. This switch is specific to the GW and SAF interlock ranges.

SS switch type drawing

 

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Switch block configurations

TYPE

POLE

PART NUMBER

POSITION 1

POSITION 2

POSITION 3

SPST

1

SS/11

OFF

OFF

ON

DPST

1

SS/21

OFF

OFF

ON

 

2

 

OFF

OFF

ON

DPST

1

SS/22

OFF

OFF

ON

 

2

 

ON

ON

OFF

3PST

1

SS/31

OFF

OFF

ON

 

2

 

OFF

OFF

ON

 

3

 

OFF

OFF

ON

3PST

1

SS/32

OFF

OFF

ON

 

2

 

OFF

OFF

ON

 

3

 

ON

ON

OFF

3PST

1

SS/33

OFF

OFF

ON

 

2

 

ON

ON

OFF

 

3

 

ON

ON

OFF

 NON LOCKING ON/OFF SWITCH

Non locking fail safe switches have a dwell position of 15 degrees in which the switch is ON and 345 degree sector in which the switch is OFF. This switch is specific to the Hinge and Link systems

GW0 switch type drawing

 

Switch block configurations

TYPE

POLE

PART NUMBER

356 SEGMENT

4 SEGMENT

SPST

1

GW011

OFF

ON

DPST

1

GW021

OFF

ON

 

2

 

OFF

ON

DPST

1

GW022

ON

OFF

 

2

 

OFF

ON

3PST

1

GW031

OFF

ON

 

2

 

OFF

ON

 

3

 

OFF

ON

3PST

1

GW032

ON

OFF

 

2

 

OFF

ON

 

3

 

OFF

ON

3PST

1

GW033

ON

OFF

 

2

 

ON

OFF

 

3

 

OFF

ON

 Special cam configurations available on request.

 

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