摘要:
Two molded case electrical switches (3a,3b) such as circuit breakers, network protectors, disconnect switches and transfer switches, are secured together side-by-side by joining blocks (21) having tongues (27,29) extending along their sidewalls (23) which engage undercutting grooves (13,17) undercutting the irregular surfaces (11a,11b) of the confronting sidewalls (9a,9b) of the switch molded casings with an interference fit. Separate joining blocks (21f,21r) for the front (5f) and rear sections (5r) of the molded casing are driven into place and retained by bolts (45) engaging flanges (49a-49b) on the molded casing. The poles (7) are paralleled by external conductors (61,63) in any desired configuration so that the standard switches (3a,3b) can be used without customization.
摘要:
The large close spring (18) in the operating mechanism (17) of electrical switching apparatus (1) is charged by a charging mechanism (387) which includes a charging cam (173) mounted on a cam shaft (115) and rotated by a ratchet wheel (389). An elongated handle (31) is mounted for rotation about a pivot axis (127) offset laterally from the cam shaft (115). A drive link (397) which successively engages the teeth (403) on the ratchet wheel (389) is pivotally connected to the handle (31) at a point closer to the handle pivot axis than the radius of the ratchet wheel (389) to increase the mechanical advantage of the handle (31). A common spring (413) biases the drive link (397) and a stop dog (409) against the ratchet wheel (389). A turned pin (401) on the drive link (397) is used to engage the ratchet teeth (403) which have an arcuate profile including a radius (403r) at the root configured to be engaged by the turned pin (401). A similar drive link (431) with a turned pin (433) to engage the ratchet teeth (403) is reciprocated by an electric motor (421). A handle decoupling cam (391) and a motor decoupling cam (393) lift the respective drive links (397,431) out of engagement with the ratchet wheel (389) when the close spring (18) becomes fully charged. A lifting pin (447) and/or a lateral projection (417) on the handle drive link (397) disengage the handle (31) from the ratchet wheel (389) as the handle (31) is stowed.
摘要:
A circuit breaker (10) with trip indicator assembly (40) for indicating the trip status of the circuit breaker (10). The trip indicator assembly (40) includes a spring powered shaft (50) movable between a cocked position and a trip position in which the spring powered shaft (50) protrudes through the housing (12) of the circuit breaker (10) to indicate the trip status. The shaft (50) is operatively connected to a trip actuating mechanism (26) of the circuit breaker (10) so as to actuate the shaft (50) in response to the trip actuating mechanism (26) actuating an operating mechanism (22) of the circuit breaker (10). A lost motion coupling (72) is provided to assure that the trip indicator assembly (40) is not actuated until after actuation of the operating mechanism (22). A bell alarm switch assembly (82) for signalling the trip status of the circuit breaker (10) may be operatively connected to the trip indicator assembly (40).
摘要:
The large close spring (18) in the operating mechanism (17) of electrical switching apparatus (1) is charged by a charging mechanism (387) which includes a charging cam (173) mounted on a cam shaft (115) and rotated by a ratchet wheel (389). An elongated handle (31) is mounted for rotation about a pivot axis (127) offset laterally from the cam shaft (115). A drive link (397) which successively engages the teeth (403) on the ratchet wheel (389) is pivotally connected to the handle (31) at a point closer to the handle pivot axis than the radius of the ratchet wheel (389) to increase the mechanical advantage of the handle (31). A common spring (413) biases the drive link (397) and a stop dog (409) against the ratchet wheel (389). A turned pin (401) on the drive link (397) is used to engage the ratchet teeth (403) which have an arcuate profile including a radius (403r) at the root configured to be engaged by the turned pin (401). A similar drive link (431) with a turned pin (433) to engage the ratchet teeth (403) is reciprocated by an electric motor (421). A handle decoupling cam (391) and a motor decoupling cam (393) lift the respective drive links (397,431) out of engagement with the ratchet wheel (389) when the close spring (18) becomes fully charged. A lifting pin (447) and/or a lateral projection (417) on the handle drive link (397) disengage the handle (31) from the ratchet wheel (389) as the handle (31) is stowed.
摘要:
A circuit breaker (10) with trip indicator assembly (40) for indicating the trip status of the circuit breaker (10). The trip indicator assembly (40) includes a spring powered shaft (50) movable between a cocked position and a trip position in which the spring powered shaft (50) protrudes through the housing (12) of the circuit breaker (10) to indicate the trip status. The shaft (50) is operatively connected to a trip actuating mechanism (26) of the circuit breaker (10) so as to actuate the shaft (50) in response to the trip actuating mechanism (26) actuating an operating mechanism (22) of the circuit breaker (10). A lost motion coupling (72) is provided to assure that the trip indicator assembly (40) is not actuated until after actuation of the operating mechanism (22). A bell alarm switch assembly (82) for signalling the trip status of the circuit breaker (10) may be operatively connected to the trip indicator assembly (40).
摘要:
An actuator assembly (22) for an electrical power switch apparatus, the actuator assembly (22) having a housing (24) and a plunger (30) positioned within the housing (24) where the plunger (30) is movable between a set position and an actuated position. The plunger (30) includes a compression spring (38) to provide a pre-load thereto that biases the plunger (30) away from the set position and toward the actuated position. A magnet (42) contained in the housing (24) and positioned proximate to the plunger (30) establishes a magnetic force which overcomes the pre-load of the compression spring (38) and maintains the plunger (30) in a set position. A coil assembly (46), that when energized, produces an electromagnetic force which bucks the magnetic force established by the magnet (42) allowing the plunger (30) to be propelled by the compression spring (38) to the actuated position. A screw (54) extends through an opening (56) in the plunger (30) for engagement with the compression spring (38) so that rotation of the screw (54) results in the adjustment or calibration of the pre-load of the compression spring (38).
摘要:
Electrical switching apparatus (1) such as a power circuit breaker, network protector or switch has a self-supporting operating mechanism module (17) including a cage (95) formed by a pair of side plates (97) rigidly clamped in spaced relation by spacers (99). The cage (95) supports all of the operating mechanism components (18,107,109,113) including a helical compression close spring (18) mounted fully between the side plates (97) and coupled to a cam member (171) through a rocker (155) in a manner which maintains the forces longitudinal to the spring (18). The cam member (171) has a charging cam (173) with a charge profile (189a) for compressing the close spring (18) and a close profile (189b) through which the spring (18) drives the cam member (171) to effect a controlled release of stored energy to close the contacts of the apparatus. A close prop (223), spring biased to an unlatched position, is latched to secure the close spring (18) in the charged state by a latch assembly (225) reset by a reset lever (247) separate from the close prop (223) which in turn is reset by rotation of the cam member (171) during charging. An interlock (265) prevents release of the close spring (18) when the contacts (43) are closed or the trip release is actuated. An indicator (27) actuated by a driver (345) pivoted against the cam shaft (115) snaps from a DISCHARGED to a CHARGED indication as the close spring (18) becomes fully charged and the driver (345) drops into a notch (343) created by a flat on the cam shaft (115). Rotating shafts (213, 239) are journalled solely in confronting apertures in the side plates (97). The can shaft (115) is captured between bushings (117) seated in non-circular openings (119) in the side plates (97) thereby eliminating the need for any fasteners. Likewise, other parts (165) mounted between the side plates (97) and joined by pins (167) having enlarged heads (169) retained by the side plates (97) do not need retainers. Various shafts (451) extending between the side plates (97) have reduced diameter ends (457) of progressive lengths for successive insertion in one side plate (97 2 ) to aid in assembly of the operating mechanism (17).
摘要:
Electrical switching apparatus (1) such as a power circuit breaker, network protector or switch has a self-supporting operating mechanism module (17) including a cage (95) formed by a pair of side plates (97) rigidly clamped in spaced relation by spacers (99). The cage (95) supports all of the operating mechanism components (18,107,109,113) including a helical compression close spring (18) mounted fully between the side plates (97) and coupled to a cam member (171) through a rocker (155) in a manner which maintains the forces longitudinal to the spring (18). The cam member (171) has a charging cam (173) with a charge profile (189a) for compressing the close spring (18) and a close profile (189b) through which the spring (18) drives the cam member (171) to effect a controlled release of stored energy to close the contacts of the apparatus. A close prop (223), spring biased to an unlatched position, is latched to secure the close spring (18) in the charged state by a latch assembly (225) reset by a reset lever (247) separate from the close prop (223) which in turn is reset by rotation of the cam member (171) during charging. An interlock (265) prevents release of the close spring (18) when the contacts (43) are closed or the trip release is actuated. An indicator (27) actuated by a driver (345) pivoted against the cam shaft (115) snaps from a DISCHARGED to a CHARGED indication as the close spring (18) becomes fully charged and the driver (345) drops into a notch (343) created by a flat on the cam shaft (115). Rotating shafts (213, 239) are journalled solely in confronting apertures in the side plates (97). The can shaft (115) is captured between bushings (117) seated in non-circular openings (119) in the side plates (97) thereby eliminating the need for any fasteners. Likewise, other parts (165) mounted between the side plates (97) and joined by pins (167) having enlarged heads (169) retained by the side plates (97) do not need retainers. Various shafts (451) extending between the side plates (97) have reduced diameter ends (457) of progressive lengths for successive insertion in one side plate (97 2 ) to aid in assembly of the operating mechanism (17).
摘要:
Two molded case electrical switches (3a,3b) such as circuit breakers, network protectors, disconnect switches and transfer switches, are secured together side-by-side by joining blocks (21) having tongues (27,29) extending along their sidewalls (23) which engage undercutting grooves (13,17) undercutting the irregular surfaces (11a,11b) of the confronting sidewalls (9a,9b) of the switch molded casings with an interference fit. Separate joining blocks (21f,21r) for the front (5f) and rear sections (5r) of the molded casing are driven into place and retained by bolts (45) engaging flanges (49a-49b) on the molded casing. The poles (7) are paralleled by external conductors (61,63) in any desired configuration so that the standard switches (3a,3b) can be used without customization.