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Brand: CHINT
CHINT NXU-II Surge Protective Device, Class II
Description
A pluggable Class II surge protective device for incoming boards
The NXU-II is a plug-in surge protective device (SPD) from CHINT for lightning and switching surges on the incoming distribution board. The catalog lists it as a Class II device to IEC/EN 61643-11 with a replaceable protection module on a separate base, so a spent module can be changed without disconnecting or rewiring the line. A /F version adds a remote-signal contact.
Technical specifications
| Parameter | Specification |
|---|---|
| Standard | IEC/EN 61643-11; CE and RoHS |
| Test class | Class II |
| Maximum discharge current Imax (8/20 us) | 20 or 40 kA |
| Nominal discharge current In | 10 or 20 kA |
| Maximum continuous operating voltage Uc | 255, 275, 320, 385 and 440 V AC (275, 320, 385 and 440 V in the order list) |
| Voltage protection level Up | 1.2, 1.5, 1.6, 1.8 and 2.0 kV across the range |
| Configurations | 1P, 2P, 3P, 4P, 1P+N and 3P+N |
| Module width | 18 mm for 1P, 1P+N and 2P; 36 mm for 3P, 3P+N and 4P |
| Conductor and torque | Up to 10 mm2 (M4, 1.5 N.m) or 16 mm2 (M5, 2.0 N.m) |
| Short-circuit withstand | 5 kA |
| Backup fuse | 63 A gL/gG for 20 kA; 125 A gL/gG for 40 kA |
| Protection degree | IP20 |
| Order codes (examples) | NXU-II 20kA/275V 1P 409698; NXU-II/F 20kA/275V 1P 409690; NXU-II 40kA/385V 3P+N 409784 |
Choosing Uc and the protection mode
The catalog gives a table tying the earthing system to the protection mode. For the TT and TN systems it lists the L-PE and N-PE mode for the 275 and 320 V versions and the L-N and N-PE mode for 3P+N and 1P+N, and it recommends the 440 V version for inductive loads. The IT system is covered with its own entry, so confirm the system and the maximum operating voltage of the grid in IEC 60364-5-534 before picking Uc. A backup fuse of the listed rating is required if the upstream protective device is larger.
Place the device as close as practical to the incomer, keep the connecting leads short, and use the /F version where a building management system should report a failed module. For heavier exposure the catalog family also lists other test classes, so ask if an installation needs a Class I device ahead of this one.
What to confirm before ordering
Send the earthing system, Uc, Imax, the pole configuration and whether the remote-signal contact is needed. A DIN-rail disconnector for the same board is the Schneider Acti9 iSW, and other protection gear sits in the electrical and power category.
Documents and quotation
The CHINT NXU-II SPD catalog is attached. Send the complete designation and quantity through the quotation form for availability from Seven Star LLC.
Datasheets & Documents
- Catalog CHINT NXU-II surge protective device (SPD) catalog Download
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About brand
CHINT is a Chinese electrical equipment group founded in 1984 that makes low-voltage distribution and control apparatus and smart energy products. The group states that it operates in more than 140 countries and regions.
Seven Star LLC is an independent supplier in Muscat. We list selected CHINT devices from the manufacturer catalogue for switchboards, control panels and building services in Oman and the GCC.
CHINT product series
Circuit protection includes the NXB-63 miniature circuit breaker from 1 to 63 A, the NB1-63DC DC miniature circuit breaker for up to 1000 V in solar systems, the NXBLE-32 RCBO, the NL1-63 RCCB and the NM8N moulded case circuit breakers from 16 to 1600 A. The NXU-II is a Class II surge protective device.
Control and switching includes the NCH8 modular contactors for 20 to 63 A, the NXC AC contactors from 6 to 630 A, the NXZ automatic transfer switch from 80 to 630 A and the NP8 series IP65 pushbuttons.
Where CHINT devices are used
Final distribution boards in residential and commercial buildings, main and sub-main switchboards, motor control panels, generator changeover panels and solar PV combiner and inverter circuits.
Ordering CHINT devices: what we need
Send the full designation with pole count, rated current, breaking capacity and curve for breakers, the coil voltage for contactors, and the voltage and current for transfer switches, together with the quantity.
Browse CHINT products by category: Circuit Breakers, Contactors & Overload Relays, Switchgear, Enclosures & Distribution.
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Frequently Asked Questions
What is the NXU-II?
It is a Class II plug-in surge protective device for the incoming distribution board, built to IEC/EN 61643-11 according to the CHINT catalog.
Can the protection module be replaced?
Yes. The module plugs into a separate base and can be replaced without disconnecting the line or rewiring.
What does the /F version add?
The /F version adds a remote-signal auxiliary contact for reporting module status.
Is a backup fuse needed?
The catalog lists a 63 A gL/gG fuse for the 20 kA versions and 125 A gL/gG for the 40 kA versions.
Which configurations are available?
The order list covers 1P, 1P+N, 2P, 3P, 3P+N and 4P at 275, 320, 385 and 440 V.
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