® Bussmann ® Telpower Fused Disconnect Switch TP15900-4 DC Distribution/Protection System - Rear Access FEATURES: • Recognized branch circuit protection device. • Modular design - 4 poles per module. • Ease of installation-Connection directly to bus bar. • Eliminates external wiring per pole. • LED alarm signaling (LED current 30mA max.). • Blown fuse indication. • Alarm test probe point, to allow on-site checking of alarm circuitry. • Standard 0.25” QC terminal for alarm circuit connections. • Bi-polar LED provides capability for both -48V DC SYSTEM: TP15900-4 Fused Disconnect Switch and TPA Series Fuses and +24V DC applications. CATALOG SYMBOL: TPI5900-4 • Fuse presence indication. ELECTRICAL RATING: 4-poles, 40A per pole at 145V DC • Fuse orientation rejection feature. 50A per pole at 80V DC APPROVALS: • Rear accessibility for line and load terminations. U.L. recognized as a disconnect switch for interruption of • Totally enclosed module - no moving parts. load current by means of withdrawing the fuse carrier. • Material: U.L. rated 94V-0, 140˚C rated. U.L. recognized as a component for telecommunication power distribution equipment (U.L. category QPQY2). U.L. recognized fuses for branch circuit protection. C.S.A. component acceptance for the system. FUSE TYPE: 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 mm Dimensional Data: Inches BIPOLAR ALARM 22.35 LED CONTACT 0.880" LOAD CONTACT 121.41 4.780" 99.3 77.60 3.91" 3.055" *M5 x 8 SCREW(4) LINE CONTACT *M6 x 1 PRESENCE OF SCREW(2) FUSE WINDOW 40.06 40.31 1.577" 1.587" FRONT TOP REAR *Recommended screw size (not Included). 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. TP15900-4 12-1-99 Page 1 of 3 BIF Doc #5001 SB99155 Rev. A ® Bussmann ® Telpower Fused Disconnect Switch TP15900-4 DC Distribution/Protection System TPA 3-15 Amps TPA 20-50 Amps AMPERE AMPERE RATING RATING 1,000 1,000 3 20 30 5 40 100 100 10 50 15 10 10 1 1 .1 .1 .01 .01 CURRENT IN AMPERES CURRENT IN AMPERES Dimensional Data for TPA Fuses TPA-B AMPERE 38.10 14.61 RATING 1,000 1.50" .58" 4.83 .19" 20 10.31 .41" 25 100 Five Position Spare Fuseholder Part No. 5TPH 75.57 2.98" 10 26.16 1.03" 1 SPARE FUSE DOUBLE SIDED HOLDER BODY ADHESIVE TAPE 15.88 .1 .63" .01 CURRENT IN AMPERES 12-1-99 SB99155 Rev. A TIME IN SECONDS TIME IN SECONDS 1 1 10 10 100 100 1,000 1,000 10,000 10,000 TIME IN SECONDS 1 10 100 1,000 10,000 ® Bussmann ® Telpower Fused Disconnect Switch TP15900-4 DC Distribution/Protection System 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 ≤ 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. TP15900-4 12-1-99 Page 3 of 3 BIF Doc #5001 SB99155 Rev. A