Trip Unit Summary

General-Purpose Applications

The following table shows the trip units compatible with the ComPacT NSX DC circuit breakers for general-purpose applications. For further details, refer to LVPED221002EN ComPacT NSX, ComPacT INS/INV, MasterPacT NW DC - DC PV Catalog.

Trip Units	Built-in / Interchangeable	NSX100 DC			NSX160 DC			NSX250 DC	NSX400 DC	NSX630 DC	NSX1200 DC
Trip Units	Built-in / Interchangeable	1P	2P	3P/4P	1P	2P	3P/4P	3P/4P	3P/4P	3P/4P	2P
NA (switch-disconnector)	Built-in	–	–	–	–	–	–	–	✔	✔	–
NA (switch-disconnector)	Interchangeable	–	–	✔	–	–	✔	✔	–	–	–
TM-D	Built-in	✔	✔	–	✔	✔	–	–	–	–	–
TM-D	Interchangeable	–	–	✔	–	–	✔	–	–	–	–
TM-DC	Built-in	–	–	–	–	–	–	–	✔	✔	✔
TM-DC	Interchangeable	–	–	✔	–	–	✔	✔	–	–	–
TM-G	Interchangeable	–	–	✔	–	–	✔	✔	–	–	–

Photovoltaic and Marine Applications

The following tables shows the trip units compatible with the ComPacT NSX DC circuit breakers for photovoltaic and marine applications. For further details, refer to LVPED221002EN ComPacT NSX, ComPacT INS/INV, MasterPacT NW DC - DC PV Catalog

ComPacT NSX DC PV 4P Circuit Breakers

Trip Units	Built-in / Interchangeable	NSX80 DC PV	NSX100 DC PV	NSX125 DC PV	NSX160 DC PV	NSX200 DC PV	NSX400 DC PV	NSX500 DC PV
NA (switch-disconnector)	Built-in	–	✔	–	✔	✔	✔	✔
TM-DC PV	Built-in	✔	–	✔	✔	✔	✔	✔

ComPacT NSX DC EP 4P Circuit Breakers

		NSX100–250 DC EP					NSX250_630 DC EP
Trip Units	Built-in / Interchangeable	NSX100 DC EP	NSX125 DC EP	NSX160 DC EP	NSX200 DC EP	NSX250 DC EP	NSX250 DC EP	NSX320 DC EP	NSX400 DC EP	NSX500 DC EP	NSX630 DC EP
NA (switch-disconnector)	Built-in	✔	–	✔	✔	✔	–	✔	✔	✔	✔
TM-DC EP	Built-in	✔	✔	✔	–	✔	✔	✔	✔	✔	–

Protections and Settings of Thermal-Magnetic Trip Units

The adjustment dials are on the front of the trip units.

A Overload protection threshold

B Short-circuit protection pick-up

Upgradability of Thermal-Magnetic Trip Units

Interchangeable trip units are upgradable. See tables above for more information on interchangeable trip units.

Onsite swapping of interchangeable trip units is simple and reliable:

No connections to make
No special tools (for example, calibrated torque wrench)
Compatibility of trip units ensured by mechanical cap
Torque limited screw ensures proper mounting (see drawing below)

The design of the trip units limits the risk of incorrect tightening or oversights. The simplicity of the swapping process means that it is easy to make the necessary adjustments as operation and maintenance processes evolve.

NOTE: When the trip unit has been mounted by this means, the trip unit can still be removed: the screw head is accessible.

Sealing the Protection

The transparent cover on thermal-magnetic trip units can be sealed to prevent modification of the protection settings.