® Bussmann ® Telpower Fused Disconnect Switch TP15914 DC Distribution/Protection System - Front Access FEATURES: • Front access load and line connection standard - double lug load connections 8 AWG wire • Recognized branch circuit protection device • Modular design - 4 poles per module up to four modules banked together • Ease of installation - Connection directly to bus bar • Eliminates external wiring - per pole • LED alarm signaling (LED current 10mA max.) • Blown fuse indication SYSTEM: TP15914 - 4 Pole Disconnect Switch and TPA Series Fuses. • Alarm test probe point, to allow on-site CATALOG SYMBOL: TP15914 checking of alarm circuitry ELECTRICAL RATING: 145V DC, 50A per pole. • Snap into alarm bus • Bi-polar LED provides capability for both -48V DC APPROVALS: and +24V DC applications • U.L. recognized as a disconnect switch for interruption of load current by means of withdrawing the fuse carrier. • Fuse presence indication • U.L. recognized as a component for telecommunication • Fuse orientation rejection feature power distribution equipment (U.L. category QPQYZ). • Totally enclosed module - no moving parts • U.L. recognized fuses for branch circuit protection. • Spare fuseholders available - See Part No. 5TPH and TPSFH-A. • C.S.A. component acceptance for the system. • Contact Bussmann for options on standard module (Hardware, Color, Front line connection, Mounting bezel) MATERIAL: UL rated 94V-0, - 150°C rated FUSE Fuse Type TPA TPA-B Current 3, 5, 10, 15, 20, 25, 30, 40, 50 20, 25 Voltage 170V DC 65V DC Interrupting 100 kA 20 kA UL Recognized Guide JFHR2, File E56412, CSA Certified Class 1422-30, File 53787 BIPOLAR LED ALARM CONTACT LOAD CONTACT Dimensional Data: 18.91 (10-32 Thread) .745" MOUNTING MM HOLE DIA. Inches 7.21 0.284" 38.10 38.10 1.5" 1.5" COMMON LINE BUS MOUNTING HOLE DIA. 15.88 5.46 .625" 90.58 0.215" 3.57" 76.07 108.48 3.0" 4.27" PRESENCE OF TOP FUSE WINDOW The only controlled copy of this BIF document is the electronic read-only version located on the Bussmann Network Drive. All other copies of this BIF document are by definition uncontrolled. This bulletin is intended to clearly present comprehensive product data and provide technical information that will help the end user with design applications. Bussmann reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Bussmann also reserves the right to change or update, without notice, any technical information contained in this bulletin. Once a product has been select- ed, it should be tested by the user in all possible applications. Form No. TP15914 12-28-98 Page 1 of 2 BIF Doc #5011 SB98107 Rev. A ® Bussmann ® Telpower Fused Disconnect Switch TP15914 DC Distribution/Protection System - Front Access Proper sizing of the current limiting resistor, referred to By calculating the minimum value of R as ALARM as R in the diagram below, is essential to prevent described above, the maximum available remote alarm ALARM excessive current, which could cause damage to the circuit current will not exceed 30 mA. In the event of LED in the disconnect head, from passing through the multiple fuse blows, where the fuses are connected in remote alarm circuit. Because the LED is in series with parallel on the same remote alarm bus, the total avail- the remote alarm circuit, the maximum available alarm able remote alarm circuit current will be evenly divided circuit current should be limited to no more than 30 mA. between each of the LED’s. For example, if three fuses This is the maximum sustained current that can be toler- blow, each LED, indicating the presence of a blown fuse, ated by the LED. It is important to note that when calcu- will conduct approximately 10 mA each, assuming the lating the size of the resistor, the number of circuits in total available remote alarm circuit current is 30mA. parallel on the remote alarm circuit is irrelevant. The resistor value should always be calculated assuming that the total available alarm circuit current is conducted through a single LED. This will insure that the 30 mA limitation is not exceeded. The calculations required to determine both the resistance and the wattage rating of R are shown below. ALARM METHOD FOR CALCULATING THE MINIMUM SERIES RESISTANCE VALUE NECESSARY TO LIMIT THE AVAIL- ABLE ALARM CIRCUIT CURRENT TO ² 30mA. THE MINIMUM RESISTOR WATTAGE CALCULATIONS IS ALSO SHOWN. VSYSTEM RALARM= ILED (where ILED - 30 mA max.) PRALARM = (VSYSTEM)(ILED) (where ILED - 30 mA max). Form No. TP15914 12-28-98 Page 2 of 2 SB98107 Rev. A BIF Doc #5011