DC Circuit Breaker
The DST is a high density Telecom Rackmount DC Distribution Panel designed to accommodate virtually any 48V, 24V or 12V DC power distribution requirement. Its flexibility makes it ideal for all telecom site DC power requirements, large and small.
These distribution panels accommodate up to 10 or 20 circuit breakers (depending on model) within a compact rackmount housing, occupying only 2 RU of rack space. The circuit breakers feature a unique plug-in design which requires only front access for quick, easy installation during initial power system configuration, as well as future system expansion.
Model DST-20A (UL) features dual isolated 10 circuit A and B buses, each rated at 450 amps, enabling
redundant power configuration or different voltages/ground references. A and B inputs can also be paralleled,
creating a single900 amp bus.
Model DST-10 (UL) has a single 450 amp bus which accepts up to 10 breakers.
The plug-in circuit breakers insert securely into sockets recessed in the front access panel. Breaker alarm
contacts allow optional remote tripped-breaker alarm/indication. A “mid-trip” function of the circuit breaker
provides quick visual identification of a failed circuit and distinguishes between an over-current trip and
intentional shut-off. When tripped, the toggle handle moves to a 90° position, halfway between the “on”
and manual “off” position.
Specify the required amperages when ordering and plug them into the panel during installation.
Input/output wiring is rear access via bus bars that accept single or double hole lugs. Input/output buses are secured to the load breaker sockets via solid nickel-plated copper bus material.
Mounting brackets are provided to adapt the panel for 19”or 23” racks. Snap-in hole plugs are provided for
unoccupied breaker positions and a clear protective cover which prevents accidental shut off of the breakers
and also provides for convenient placement of circuit identiﬁcation labels.
Note: The DST is shipped standard without circuit breakers.
Nominal Input/Output: 48VDC, 24VDC or 12 VDC
Total Circuit Capacity:
DST-20A: 20 Breakers
DST-10: 10 Breakers
Total Current Capacity:
DST-20A: 900 amps (dual 450 amp buses)
DST-10: 450 amps (one 450 amp bus)
Maximum Circuits per Bus: 10
1801 First Edition: Subject Standard for Power Distribution Center for Telecommunications Equipment C22.2
No. 225-M90: Canadian Standards for Telecommunication Equipment
Current Ratings: 5, 10, 15, 20, 30, 40, 50, 75 or 100 amps
Breaker rating stamped beside toggle for easy reference
Voltage Rating: 80 VDC max.
Type: Plug-in with Auxiliary Contacts
Weight: 1 Lb
-40˚ C to + 70˚ C, 450 Amps @ +35˚ C, derate to 400 Amps @ +40˚ C, 320 Amps @ +50˚ C, 150 Amps @ +70˚ C
Bus Bars: Nickel-plated copper; accepts single or double hole lugs
Front Panel: Anodized aluminum Cover, Rear Panel: Vinyl-laminated aluminum
Dimensions: (Both models)
Weight (no breakers installed): DST-20A: 12 lbs., DST-10: 9 lbs.
Tripped Breaker Contacts via Rear Panel Connector; Normally Open configuration
Note: Separate contacts for each bus on model DST-20A
Rear Panel View
Return Bus Bar Assembly – Rear Rack Mount (Sold Separately)
800 amps; Model: BBA-800
Rear Terminal Cover Assemblies
Model: RC-DST Covers rear, top, sides of bus bars.
Rear Terminal Cover Provided
(DST must be flush mounted to rack face for installation of cover)
Model: RRC Covers rear, top, sides of multiple components in relay rack.
Specify 19″ or 23″, 3 RU or 7 RU height.
(DST maybe either center or flush mount to use cover)