Allen-Bradley 1492-CB1G005 1-Pole 0.5A Supplementary Protector Circuit Breaker, G Curve, 277VAC

This is an Allen-Bradley Bulletin 1492-CB1 single pole miniature circuit breaker rated 0.5 A, part of the Rockwell Automation 1492-CB family of manual motor controllers, supplementary protectors and miniature circuit breakers. In the catalog number, CB1 means one pole, the letter that follows gives the trip curve, and the digits give the ampere rating, so a 0.5 A one pole unit is catalogued as 1492-CB1G005 or 1492-CB1H005.

The 1492-CB is an energy limiting thermal magnetic protector. A bimetal element trips on sustained overload and a magnetic element trips instantly on short circuit, and the mechanism is trip free, so the handle cannot hold the contacts closed during a fault. Allen-Bradley rates one pole units at 277V AC and lists the family under UL 1077 and UL 508, CSA, IEC/EN 60934 and VDE. Each pole is 17.8 mm wide and snaps onto 35 mm DIN rail.

A 0.5 A rating is used to protect low current branch circuits in control panels, such as PLC input and output points, relay and contactor coils, solenoids, control transformers, power supplies and instrumentation. Panel builders, controls integrators and plant electricians use these breakers when building or servicing industrial control cabinets.

Available from King Surplus inventory in Del Rio, Texas.

• Manufacturer: Allen-Bradley (Rockwell Automation)
• Bulletin: 1492-CB manual motor controller / supplementary protector / miniature circuit breaker
• Poles: 1 (1492-CB1)
• Current Rating (per record): 0.5 A
• Catalog Numbers at 0.5 A, 1 pole: 1492-CB1G005 (G curve) or 1492-CB1H005 (H curve); F curve starts at 1 A
• Trip Type: thermal magnetic, energy limiting, positively trip free
• Voltage Rating, 1 pole: 277V AC, 1 phase
• Interrupting Capability, 1 pole: 5 kA @ 277V AC U1; 3 kA @ 277V AC U2/U3; 10 kA @ 125V AC U2/U3
• IEC Miniature Circuit Breaker Rating, 1 pole: 10 kA @ 240V AC
• Tripping Characteristic: G curve 6 to 10 x In (slightly inductive loads); H curve 12 to 20 x In (highly inductive loads)
• Standards: UL 508, UL 1077, CSA 22.2 No. 14 and 235, IEC/EN 60934, VDE 0641/0660, CE
• Wire Size: #16 to 4 AWG copper; strip length 0.51 in (13 mm)
• Operating Temperature: -20 to +60 C (-40 to +140 F)
• Housing Material: melamine-phenolic
• Width: 0.7 in (17.8 mm) per pole; 35 mm DIN rail mount
• FLAG for review: photos were not read (KEID photo budget refused the call), so the full catalog number and trip curve on the device were not confirmed
• Spec Basis: record fields (model 1492-CB1, 0.5 A); Allen-Bradley Bulletin 1492-CB product overview and specifications https://support.rockwellautomation.com/cc/okcsFattachCustom/get/939374_6