power distribution - Siemens

Molded Case Circuit BreakersMotor Circuit ProtectorsSelectionGeneralProtection of Motor CircuitsMolded case circuit breakers are used in motor circuits as a disconnecting means and for short-circuit protection. They should beused in conjunction with motor-running, over-current protection devices, and should permit the motor to start without nuisance trippingfrom motor-inrush current. The circuit breaker should have a continuous current rating of not less than 115% of the motor fullloadcurrent.The recommended motor circuit protectors listed have continuous-current ratings of at least 115% of motor full-load currents. Thetrip setting positions are approximately 11 times motor full-load current. The suggested trip settings may need to be adjustedupward to no higher than 1300% of full-load current for non-design E type motors, and no greater than 1700% of full-load currentfor design E motors, to allow for motor startup due to in-rush current.Breaker Mounted Immediately Ahead of Motor StarterSiemens motor circuit protectors are recommended for use in combination motor starters to provide selective short-circuit protectionfor the motor branch circuit. The adjustable instantaneous trip feature of the Siemens motor circuit protector provides for a tripsetting slightly above the peak motor in-rush current. With this setting, no delay is introduced in opening the circuit when a faultoccurs. This circuit breaker has no time-delay trip element. Therefore it must be used in conjunction with, and immediately aheadof, the motor-running overcurrent protection device.Important: The information below does not apply to all motor applications: it is recommended that the user refer to the NationalElectrical Code (NEC) for specific needs.Table 1 (When Breaker is Mounted Immediately Ahead of Motor Starter)3-Phase Induction Type Motors (Siemens motor circuit protectors for branch circuit use with alternating-current combination, full voltage motor starters)6MOLDED CASECIRCUIT BREAKERSMotor Full Trip CatalogLoad Amperes Setting (A) Number List Price $35-50 45042-60 54048-70 630 HDM3L150L 1589.0055-80 72062-90 81069-100 90058-83 75069-100 90081-117 1050 HDM3M150L 1589.0092-133 1200104-150 1350115-150 150096-139 1250115-150 1500135-150 1750 HDM3H150L 1589.00135-150 2000135-150 2250135-150 250046-67 60055-80 72065-93 840 HFM3L250L 2111.0074-107 96083-120 108092-133 120077-111 100092-133 1200108-156 1400 HFM3M250L 2111.00123-178 1600138-200 1800154-222 2000135-194 1750162-210 2100188-220 2450 HFM3H250L 2111.00215-241 2800242-250 3150242-250 3500Motor Full Trip CatalogLoad Amperes Setting (A) Number List Price $96-139 1250115-167 1500135-194 1750 HJM3L400 3881.00154-222 2000173-250 2250192-278 2500154-222 2000185-267 2400215-311 2800 HJM3M400 3881.00246-356 3200277-400 3600308-400 4000154-222 2000185-267 2400215-311 2800 HLM3L600 5771.00246-356 3200277-400 3600308-444 4000212-306 2750254-367 3300296-428 3850 HLM3M600 5771.00338-489 4400381-550 4950423-600 5500250-361 3250292-422 3800335-483 4350 HMM3M800 8277.00385-556 5000442-638 5740500-722 6500385-556 5000462-667 6000538-778 7000 HNM3M120 13587.00615-889 8000692-1000 9000769-1111 10,000 Motor circuit protectors rated 150A and 250A are supplied with line and load lugsinstalled. If lugs are required on 400A to 1200A motor circuit breakers, order requiredlugs separately. These settings are provided for starting currents greater than 11X but not to exceed17X. Full Load Amps ( FLA ) not to exceed ampere rating of MCP.6-124Siemens Power Distribution & Control, SPEEDFAX 2007-2008 Product CatalogDiscount Schedule MCCB