Amphenol Network Solutions brand of power panels continues to be updated with more best-in-class features. Our 1RU family has been expanded with the addition of the 250TPA08 model, offering dual 8x8 TPA fuse positions with 250 amps continuous per feed, and a max rating of up to 50A each with optional connectorized outputs, and optional nrgSMART™ individual circuit current monitoring.
This industry-first, 8x8 TPA fuse panel with 250 amps continuous per feed can truly fit in 1RU, including output cabling, when connectorized outputs are selected as an option. To achieve this density, Amphenol developed a new connector, with dual locking tabs, low insertion/removal force, and simple field-installation for the outputs.
Of course, a standard version with output screw terminals is still available for those more comfortable with legacy screw terminals, and sufficient rack space to accommodate waterfall cable routing. In addition, Amphenol developed a new TPA fuse holder, enabling an 8x8 configuration in a 19" rack and 1RU, never before possible with a standard TPA fuse holder.
As with all the 1RU family, this panel is UL listed and NEBS compliant. Coupled with the broadest voltage range in the industry (±12V, ±24V, ±48V) along with a hot-swappable alarm card for serviceability, and optional nrgSMART monitoring functions, the 250TPA08 is your best and only choice for a high-density TPA fuse panel in 1RU.
Voltage range (nominal voltage)
±12VDC, ±24VDC and ±48VDC
Max. input load rating
250A @ 45°C per panel (De-rated to 180A @ 65°C)
Short circuit withstand rating
Nominal power loss at full load
Less than 45W per side @12,000W full load per side (250A x 48V);
250A @ 45°C per panel
Percentage of full power dissipation at nominal voltage
Less than 0.5%
Max. input interrupt device
125% of panel rating (for 250A rated feeds)
Optional: Vertical input terminal studs (with Keps nuts and flat washers) for dual-hole compression lugs
Two pairs of 3/8-16 studs on 1" centers per terminal [max. lug width of 1.15" (29.2 mm)]. Torque nut (using 9/16" or 15 mm socket) to 150 in/lb. (~17 N•m), max.
Optional: Horizontal input terminal landings (with Keps nuts, flat washers, and bolts) for dual-hole compression lugs
Two pairs of 3/8” holes on 5/8”-1" centers per terminal [max. lug width of 1.5" (38.1 mm)]. Torque bolt and nut (using 9/16" or 15 mm sockets) to 150 in/lb. (~17 N•m), max.
Input wire size
#2 AWG to 250 MCM
Earth GND terminal bolts (with spring washers and flat washers) for dual-hole compression lug
Three sets of 1/4-20 threaded holes on 5/8" centers. [max. lug width of .50" (12.7 mm)]. Torque bolts (using 7/16" or 12 mm socket) to 50 in/lb. (5.5 N•m), max.
Ground wire size
#14 AWG to #4 AWG
Output TPA fuse
Minimum short circuit interrupt rating
Optional: Terminal blocks, single-hole compression lugs
16, #10-32 screws [max. lug width of .50" (12.7)]. Torque screw to 20 in/lb. (2.3 N•m), max.
Optional: Output wire size, single-hole compression lug
Connector plug, latching, safe touch
Optional: Output wire size, connectors
#12 AWG to #6 AWG
Alarm relay contacts
2A @ 30 VDC; 0.6A @ 60 VDC
Max. alarm card power rating
@12V: 18mA (0.22W) @24V: 20mA (0.48W); @48V: 30mA (1.44W)
Alarm wire size
#24 AWG, typical (#26 to #20 AWG)
Height: 1.75" (44 mm)
Depth: 15.8" (401 mm)
Width: 17" (432 mm) without brackets
19” and 23” brackets included with panel
Dephth: 18.7" (475 mm) without tie bar
21.9" (557 mm) with tie bar
19” and 23” brackets included with panel
Tie bar included with panel
Voltage Sensor (nrgSMART model only):
-19.99 to +19.99V: ± 0.3V
-20V to -60V: ± 0.1V
+20V to +60V: ± 0.1V
Voltage measurement range
-60 to +60 VDC
• Voltage measurement may be slightly different than at input terminal blocks due to the voltage drop within the panel.
• Sensors are factory calibrated and do not require user adjustment.
Current Sensor (nrgSMART model only):
Precision / accuracy
±5% precision, ±0.25A accuracy
Example: 40A current, will measure 40A ± (40A*5%) ± 0.25A
= 40A ± 2.0A ± 0.25A
= 37.75A to 42.25A
Communication (nrgSMART model only):
nrgOS minimum required version
nrgNET communication protocol
Proprietary nrgNET used to communicate between panels and controller
Removable 5-pin connector with screw down terminals
nrgNET connector functions
nrgNET IN from the nrgCONTROL or upstream nrgSMART panel
nrgNET OUT to downstream nrgSMART panel
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22425 East Appleway Ave #11
Liberty Lake, WA 99019
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