George Risk Industries

George Risk Industries, Inc.

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George Risk Industries | When Reliability Matters

28, 29, 29P Series Standard Surface Mount Switch Sets

This series offers a standard gap of 1 inch, a wide gap of up to 1 1/2 inches and an extra wide gap of 2 inches and can be installed on a steel surface with a minimum gap penalty. The “P” style is a pre-wired switch with 2 feet of conductor cable. A broad range of mounting brackets are also available.

Series Highlights:

  • Lifetime warranty against workmanship, material and factory defects
  • UL and ULC approved
  • Concealed terminals on 28 Series
  • 24" jacketed cable on PA Series
  • Longer leads upon request on PA series
  • Side mounted screw terminals on 29 series
  • Standard gap up to 1", 5/8" on steel
  • Wide gap up to 1 1/2", 3/4" on steel
  • Extra wide gap up to 2", 1" on steel
  • Spacers, covers and screws Included
  • Private labeling on request
  • Built-in E.O.L. resistors and diodes available on request
  • Switches or magnet only are available separately
  • Supervisory loop or dummy terminals available

Part Numbers

Closed Loop Open Loop SPDT DPDT
Standard Gap 28A 28B 28C  
Up to 1” 29A 29B 29C  
5/8” on Steel 29PA 29PB 29PC 29PD
Wide Gap 28AWG 28BWG 28CWG  
Up to 1 1/2” 29AWG 29BWG 29CWG  
3/4” on Steel 29PAWG 29PBWG 29PCWG 29PDWG
Extra Wide Gap 28AXWG 28BXWG 28CXWG  
Up to 2” 29AXWG 29BXWG 29CXWG  
1” on Steel 29PAXWG 29PBXWG 29PCXWG  

Specifications

GRI products meet or exceed these minimum general specifications. (View glossary of naming conventions.)

Part
Number
Loop Type Electrical
Configuration
Reed
Form
Maximum
Initial Contact
Resistance (Ω)
Maximum
Contact
Rating (W)
Maximum
Switching
Voltage (VDC)
Maximum
Switching
Current (A)
28A Closed N/O A .150 10 160 .400
28AWG Closed N/O A .150 10 160 .400
28AXWG Closed N/O A .150 10 160 .400
29A Closed N/O A .150 10 160 .400
29AWG Closed N/O A .150 10 160 .400
29AXWG Closed N/O A .150 10 160 .400
29PA Closed N/O A .150 10 160 .400
29PAWG Closed N/O A .150 10 160 .400
29PAXWG Closed N/O A .150 10 160 .400
28B Open N/C B .140 5 175VDC .250
28BWG Open N/C B .140 5 175VDC .250
28BXWG Open N/C B .140 5 175VDC .250
29B Open N/C B .140 5 175VDC .250
29BWG Open N/C B .140 5 175VDC .250
29BXWG Open N/C B .140 5 175VDC .250
29PB Open N/C B .140 5 175VDC .250
29PBWG Open N/C B .140 5 175VDC .250
29PBXWG Open N/C B .140 5 175VDC .250
28C Open/Closed SPDT C .140 5 175VDC .250
28CWG Open/Closed SPDT C .140 5 175VDC .250
28CXWG Open/Closed SPDT C .140 5 175VDC .250
29C Open/Closed SPDT C .140 5 175VDC .250
29CWG Open/Closed SPDT C .140 5 175VDC .250
29CXWG Open/Closed SPDT C .140 5 175VDC .250
29PC Open/Closed SPDT C .140 5 175VDC .250
29PCWG Open/Closed SPDT C .140 5 175VDC .250
29PCXWG Open/Closed SPDT C .140 5 175VDC .250
29PD   DPDT CX2 .140 5 175VDC .250
29PDWG   DPDT CX2 .140 5 175VDC .250