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Home My WebLink About1151_otec_specs cumminspower.com ©2013 Cummins Power Generation Inc. | S-1639b (6/13) Specification sheet Transfer switch OTEC and OTECSE open transition 125-600 Amp Description OTEC transfer switches are designed for operation and switching of electrical loads between primary power and standby generator sets. They are suitable for use in emergency, legally required, and optional standby applications. The switches monitor both power sources, signal generator set startup, automatically transfer power, and return the load to the primary power source once a stable utility is available. The fully integrated controller is designed for practical functionality, with LED indicators and digital pushbuttons for ease of operator use. The service entrance transfer switch meets UL 1008 standards for service entrance applications. The switch contains an UL-listed overcurrent disconnect device on the main incoming utility source. All switches are UL 1008 Listed with UL Type Rated cabinets and UL Listed CU-AL terminals. All switches are certified to CSA 282 Emergency Electrical Power Supply for Buildings, up to 600 VAC. NEC Equipment shall be suitable for use in systems compliant to 700, 701 and 702. All switches comply with NFPA 70, 99 and 110. All switches comply with NEMA ICS 10. All switches comply with IEEE 446 Recommended Practice for Emergency and Standby Power Systems. This transfer switch is designed and manufactured in facilities certified to ISO9001. Features Microprocessor control - Easy-to-use, standard control. LEDs display transfer switch status; pushbuttons allow operator to activate control test, exercise timing and transfer mode. Overcurrent disconnect device (on SE models) – Square D UL-Listed 489 molded case circuit breaker. Programmed transition – Open transition timing can be adjusted to completely disconnect the load from both sources for a programmed time period, as recommended by NEMA MG-1 for transfer of inductive loads. Advanced transfer switch mechanism - Unique bi-directional linear actuator provides virtually friction- free, constant force, straight-line transfer switch action during automatic operation. Manual operation - Manual operating handles, shielded termination, and over-center contact mechanisms allow effective manual operation under de-energized conditions. Positive interlocking - Mechanical and electrical interlocking prevent source-to-source connection through the power or control wiring. Main contacts - Heavy-duty silver alloy contacts with multi-leaf arc chutes are rated for 100% load interruption. They require no routine contact maintenance and provide 100% continuous current ratings. Easy service/access - Single-plug harness connection and compatible terminal markings simplify servicing. Access space is ample. Door-mounted controls are field-programmable; no tool is required. Complete product line - Cummins Power Generation offers a wide range of equipment, accessories and services to suit virtually any backup power application. Warranty and service - Products are backed by a comprehensive warranty and a worldwide network of distributors with factory-trained service technicians. cumminspower.com ©2013 Cummins Power Generation Inc. | S-1639b (6/13) Transfer switch mechanism • Transfer switch mechanism is electrically operated and mechanically held in the Source 1 and Source 2 positions. The transfer switch incorporates electrical and mechanical interlocks to prevent inadvertent interconnection of the sources. • Independent break-before-make action is used for 3-pole switches. This design allows control of the operating speed of the transfer switch for proper transfer of motor and rectifier-based loads (programmed transition feature). • Electrical interlocks prevent simultaneous closing signals to normal and emergency contacts and interconnection of normal and emergency sources through the control wiring. • High pressure silver alloy contacts resist burning and pitting. Separate arcing surfaces further protect the main contacts. Contact wear is reduced by multiple leaf arc chutes that cool and quench the arcs. Barriers separate the phases to prevent interphase flashover. A transparent protective cover allows visual inspection while inhibiting inadvertent contact with energized components. • Switch mechanism, including contact assemblies, is third-party certified to verify suitability for applications requiring high endurance switching capability for the life of the transfer switch. Withstand and closing ratings are validated using the same set of contacts, further demonstrating the robust nature of the design. Specifications Arc interruption Multiple leaf arc chutes cool and quench the arcs. Barriers prevent interphase flashover. Neutral bar A full current-rated neutral bar with lugs is standard on enclosed 3-pole transfer switches. Auxiliary contacts Two contacts (one for each source) are provided for customer use. Wired to terminal block for easy access. Rated at 10A continuous and 250 VAC maximum. Operating temperature -22 oF (-30 oC) to 140 oF (60 oC) Storage temperature -40 °F (-40 °C) to 140 °F (60 °C) Humidity Up to 95% relative, non-condensing Altitude Up to 10,000 ft (3,000 m) without derating Total transfer time (source-to-source) Will not exceed 6 cycles at 60 Hz with normal voltage applied to the actuator and without delayed transition enabled. Manual operation handles Transfer switches are equipped with permanently attached operating handles and quick-break, quick-make contact mechanisms suitable for manual operation under de-energized conditions. Open transition/programmed – Controls the time required for the device to switch from source to source, so that the load-generated voltages decay to a safe level before connecting to an energized source. Recommended by NEMA MG-1 to prevent nuisance tripping breakers and load damage. Adjustable 0-60 seconds, default 0 seconds. Open transition/in-phase – Initiates open transition transfer when in-phase monitor senses both sources are in phase. Operates in a break-before-make sequence. Includes ability to enable programmed transition as a backup. If sources are not in phase within 120 seconds, the system will transfer using programmed transition. cumminspower.com ©2013 Cummins Power Generation Inc. | S-1639b (6/13) Microprocessor control • Simple, easy-to-use control provides transfer switch information and operator controls • LED lamps for source availability and source connected indication, exercise mode, and test mode. LED status lamps also provided for control set-up and configuration. • Pushbutton controls for initiating test, overriding time delays and setting exercise time. • Field-configurable for in-phase open or programmed open transition. • Integral exerciser clock • Control is prototype-tested to withstand voltage surges per EN 60947-6-1. • Gold-flashed generator start contacts Control functions Voltage sensing: All phases on the normal source and single phase on generator source. Normal Source Pickup: adjustable 90-95%, Dropout: adjustable 70-90% of nominal voltage; Generator Source Pickup: 90%, dropout: 75% of nominal voltage. Frequency sensing: Generator Source Pickup: 90% of nominal frequency; Dropout: 75% of nominal frequency. Exerciser clock: Switch is furnished with an integral engine exerciser configurable for operation on a 7, 14, 21, or 28-day cycle with a fixed exercise period duration of 20 minutes. A 12-hr exerciser time offset allows for the convenient setting of exercise time without the need to activate the timer at the exact time that you need to schedule the generator exercise for. Software selectable capability allows for the exercising of the generator with or without load. Time delay functions Engine start: Prevents nuisance genset starts due to momentary power system variation or loss. Adjustable: 0-10 seconds; default: 3 seconds. Transfer normal to emergency: Allows genset to stabilize before application of load. Prevents power interruption if normal source variation or loss is momentary. Allows staggered transfer of loads in multiple transfer switch systems. Adjustable 0-300 seconds, default 5 seconds. Retransfer emergency to normal: Allows the utility to stabilize before retransfer of load. Prevents needless power interruption if return of normal source is momentary. Allows staggered transfer of loads in multiple transfer switch systems. Adjustable 0-30 minutes, default 10 minutes. Genset stop: Maintains availability of the genset for immediate reconnection in the event that the normal source fails shortly after transfer. Allows gradual genset cool down by running unloaded. Adjustable 0-30 minutes, default 10 minutes. Delayed (programmed) transition: Controls the speed of operation of the transfer switch power contacts to allow load generated voltages from inductive devices to decay prior to connecting a live source. Adjustable 0-10 seconds, default 0 seconds. Options Available through Accessories specification sheet AC-170. cumminspower.com ©2013 Cummins Power Generation Inc. | S-1639b (6/13) UL withstand and closing ratings The transfer switches listed below must be protected by circuit breakers or fuses. Referenced drawings include detailed listings of specific breakers or fuse types that must be used with the respective transfer switches. Consult with your distributor/dealer to obtain the necessary drawings. Withstand and Closing Ratings (WCR) are stated in symmetrical RMS amperes. Transfer switch ampere MCCB protection Special circuit breaker protection WCR at volts max with specific manufacturers MCCBs Max MCCB rating Drawing reference With specific current limiting breakers (CLB) Max CLB rating Drawing reference 125 14,000 at 600 V 225 A 098-6885 200,000 @ 600 V 225 A 098-6918 225 30,000 at 600 V 400 A 098-6886 200,000 @ 600 V 400 A 098-6919 400, 600 65,000 at 600 V 1200 A 098-6887 200,000 @ 600 V 1200 A 098-6920 Fuse protection Transfer switch ampere WCR at volts max. with current limiting fuses Max fuse, size and type Drawing reference 125 200,000 at 600 V 200 A Class, J, RK1, RK5, T 098-6885 225 200,000 at 600 V 1200 A Class L or T, or 600 A class J, RK1, RK5 098-6886 400, 600 200,000 at 600 V 1200 A Class L or T, or 600 A Class, J, RK1, RK5 098-6887 Enclosures The transfer switch and control are wall-mounted in a key-locking enclosure. Wire bend space complies with 2011 NEC. Dimensions – transfer switch in UL type 1 enclosure Amp rating Height Width Depth Weight Outline drawing Door closed Door open in mm in mm in mm in mm lb kg 125 27.0 686 20.5 521 12.0 305 31.5 800 82 37 0310-0544 225 35.5 902 26.0 660 16.0 406 41.0 1042 165 75 0310-0414 400, 600 54.0 1372 25.5 648 18.0 457 42.0 1067 225 102 0310-1307 Dimensions – transfer switch in UL type 3R enclosure Amp rating Height Width Depth Weight Cabinet type Outline drawing Door closed Door open in mm in mm in mm in mm lb kg 125 34.0 864 26.5 673 12.5 318 36.5 927 125 57 3R 0310-0453 225 42.5 1080 30.5 775 16.0 406 44.0 1118 215 97 3R 0310-0454 400, 600 59.0 1499 27.5 699 16.5 419 41.5 1054 275 125 3R 0310-1315 4 0310-1316 Dimensions for SE models– transfer switch in UL type 1 enclosure Amp rating Height Width Depth Weight Outline drawing Door closed Door open in mm in mm in mm in mm lb kg 40, 70, 100, 125 45.8 1164 32.0 814 16.3 413.0 45.9 1165 300 136 0500-4721 150, 200, 225, 250 73.6 1869 32.3 820 19.7 499.0 49.6 1259 500 227 0500-4606 300, 400, 600 74.5 1892 34.4 873 20.1 510.4 50.9 1293 520 236 0500-4611 Dimensions for SE models – transfer switch in UL type 3R or 12 enclosure Amp rating Height Width Depth Weight Outline drawing Door closed Door open in mm in mm in mm in mm lb kg 40, 70, 100, 125 45.8 1164 32.0 814 16.3 413.0 45.9 1165 340 154 0500-4721 150, 200, 225, 250 73.6 1869 32.3 820 19.7 499.0 49.6 1259 580 263 0500-4606 300, 400, 600 74.5 1892 34.4 873 20.1 510.4 50.9 1293 600 272 0500-4611 North America 1400 73rd Avenue N.E. Minneapolis, MN 55432 USA Phone 763 574 5000 Fax 763 574 5298 ©2013 Cummins Power Generation Inc. All rights reserved. Cummins Power Generation and Cummins are registered trademarks of Cummins Inc. PowerCommand, AmpSentry, InPower and “Our energy working for you.” are trademarks of Cummins Power Generation. Other company, product, or service names may be trademarks or service marks of others. Specifications are subject to change without notice. S-1639b (6/13) cumminspower.com Transfer switch lug capacities All lugs accept copper or aluminum wire unless indicated otherwise. Transfer switch ampere Cables per phase Size 125 1 #12 AWG-2/0 225 1 #6 AWG – 300 MCM 400 1 3/0 – 600 MCM 400 2 3/0 - 250 MCM 600 2 250 - 500 MCM Submittal detail Amperage ratings  125  225  400  600 Voltage ratings  R021 208  R023 240  R026 480 Pole configuration  A028 Poles - 3 (solid neutral) Frequency  A044 60 Hertz Application  A035 Utility to genset System options  A041 Single phase, 2-wire or 3-wire  A042 Three phase, 3-wire or 4-wire Enclosure  B002 Type 3R: intended for outdoor use, provides some protection from dirt, rain and snow (IEC Type IP34) Standards  A046 UL 1008/CSA certification Control voltage  M033 12V, Genset starting voltage  M034 24V, Genset starting voltage Warranty  G009 1 year comprehensive Accessories  AC-170 Accessories specifications sheet (control options, battery chargers, aux relays, terminal blocks, guards)