Cutler Hammer CH240GF 2-pole GFCI circuit breaker can be installed on a 120/240V AC single phase, 3 wire system, the 120/240V AC portion of a 240/120 volt, 3 phase, 4 wire system, or on a 208Y/120 volt, 3 phase, 4 wire system. When installed on these systems, protection is provided for 2 wire, 240V AC or 208V AC circuits; 3 wire, 120/240V AC circuits.

CH240GF - Cutler-Hammer Ground Fault Circuit Breaker

Cutler-Hammer product is a two pole plug-on ground fault circuit breaker features thermal magnetic molded case for extra protection. circuit breaker has current rating of 40 amps and voltage rating of 120/240 vac. it is a common trip breaker and accommodates copper/aluminum wire of size 14 - 4 awg. 
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Specifications : 
• Manufacturer : Cutler Hammer CH
• Cat. No. : CH240GF
• Alternate Part No. : CH240GF 
• Product Type : Ground Fault Circuit Breaker GFI
• Trip Type : Common 
• No. Of Pole : 2 Pole 
• Voltage Rating : 120/240 Vac 
• Amperage : 40 Ampere 
• Interrupting Rating 10000 Ampere 
• 5 Milliampere Trip Sensitivity 
• Wire Size 14 To 4 Awg (Copper) 
• Plug On Mounting 
• Cutler Hammer Loadcenter 
• GFCB Model GFI
• Authentic Cutler-Hammer Product

• Ground fault circuit interrupters (GFCI) are an effective means of preventing severe electrical shock. GFCIs are installed to protect areas of the home, such as the kitchen, bathroom or laundry, where electrical appliances or products may come into contact with water.
• GFCIs are designed to protect against severe electrical shock or electrocution from ground faults. Ground faults occur when the electrical current in an appliance strays outside its normal path, and the human body becomes part of the path through which the electrical current may flow.
• To protect equipment from damaging ground faults, GFCIs continuously monitor the difference in current between the hot and neutral conductors. If the electricity going to an outlet equals the current coming back from the outlet, the GFCI is dormant. If the electricity going to an outlet is greater than 5mA than the current coming back from the outlet, the GFCI will open the circuit to stop of flow of electricity.