TP15900-4

Description: 4-pole disconnect switch for use with Telpower fuses Type TPA & TPA-B.

Ratings:
Volts: 145Vdc (40A); 80Vdc (50A)
Amps: 40A@145Vdc; 50A@80Vdc

Agency Information: CE, UL Recognized File E97649 as a disconnect switch for interruption of load current by means of withdrawing the fuse carrier. UL Recognized as a component for telecommunication power distribution equipment (UL category QPQY2). UL Recognized fuses for branch circuit protection. CSA Component Acceptance for the system.
Flammability Rating: UL 94V0, 140°C.

Features and Benefits
• Ease of installation - connection directly to busbar, reduces external wiring per pole. Rear accessibility for line and load terminations
• LED alarm signaling (LED current 30mA max)
• Local and remote open-fuse indication along with fuse orientation rejection feature and fuse presence indication
• Alarm test probe point, to allow on-site checking of alarm circuitry

Typical Applications
• Telecommunications DC power circuit protection

Catalog
Numbers       Description
TP15900-4    4-Pole common disconnect switch
TP15900-41  4-Pole common disconnect switch w/ Split Alarm, Split Line

Dimensions - mm (in)


Accessories
• Spare fuse holders: Catalog Numbers 5TPH and TPSFH-AS.

DC Distribution/Protection System
Proper sizing of the current limiting resistor, referred to as RALARM in the diagram below, is essential to prevent excessive current, which could cause damage to the LED in the disconnect head, from passing through the remote alarm circuit. Because the LED is in series with the remote alarm circuit, the maximum available alarm circuit current should be limited to no more than 30 mA.
This is the maximum sustained current that can be tolerated by the LED. It is important to note that when calculating the size of the resistor, the number of circuits in 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 RALARM are shown below.
By calculating the minimum value of RALARM as described above, the maximum available remote alarm circuit current will not exceed 30 mA. In the event of multiple fuse blows, where the fuses are connected in parallel on the same remote alarm bus, the total available remote alarm circuit current will be evenly divided between each of the LED’s. For example, if three fuses blow, each LED, indicating the presence of a blown fuse, will conduct approximately 10 mA each, assuming the total available remote alarm circuit current is 30mA.

METHOD FOR CALCULATING THE MINIMUM SERIES RESISTANCE VALUE NECESSARY TO LIMIT THE AVAILABLE ALARM CIRCUIT CURRENT TO ² 30mA. THE MINIMUM RESISTOR WATTAGE CALCULATIONS IS ALSO SHOWN.

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TPA & TPA-B

Description: DC power distribution indicating fuses.

Ratings:
Volts: 170Vdc TPA; 65Vdc TPA-B
Amps: 3-50A TPA; 20-30A TPA-B
IR: 100kA TPA; 20kA TPA-B

Agency Information: CE, UL Recognized, Guide JFHR2, File E56412, CSA Certified, Class 1422-30, File 53787.
U.L. recognized as a disconnect switch for interruption of load current by means of withdrawing the fuse carrier.
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.

Features and Benefits
• Indication pin provides for local and remote indication when used with Cooper Bussmann® TP15900-4 and TP15914 disconnect switches
• Patented “orange ring” fuse orientation features assures correct fuse position
• The UL Recognized ratings and current-limiting capability make this fuse ideal for cable protection on existing DC power distribution systems
• A unique blue label is used on all Telpower fuses to designate their DC capability
• 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 and +24V DC applications.
• Fuse presence indication.
• Fuse orientation rejection feature.
• Rear accessibility for line and load terminations.
• Totally enclosed module - no moving parts.
• Material: U.L. rated 94V-0, 140°C rated.

Typical Applications
• Telecommunications DC power circuit protection

Catalog Numbers (Amps)

Catalog numbers	amp rating
TPA-3	3
TPA-5	5
TPA-10	10
TPA-15	15
TPA-20	20
TPA-25	25
TPA-30	30
TPA-40	40
TPA-50	50
TPA-B-20	20
TPA-B-25	25
TPA-B-30	30

Dimensions - mm (in)

Five Position Spare Fuseholder Part No. 5TPH


Current - time Curve - TPA 3-15 Amps

Current - time Curve - TPA 20-50 Amps

Current - time Curve - TPA-B



Accessories
• Spare fuse holders: 5 position holder; 5TPH; 6 position holder; TPSFH-AS
• Use with fused disconnect switches TP15900-4, TP15914