CHNT NH40 Series Switch Disconnectors & NH40SZ PC-class Automatic Transfer Switches
CHNT NH40 series integrates two core product types: single-throw manual isolating switches and NH40SZ dual-power automatic transfer switches (PC grade). Applicable to AC 50Hz circuits with rated voltage up to 690V, widely used in industrial low-voltage power distribution cabinets for circuit isolation, manual load switching, and automatic switching between mains and standby power supply. Complete current specifications cover 100A, 125A, 1000A, 1250A, with 3P/4P pole options and multiple operation modes.
Model Parameters & Features Table
| No. | Model | Category | Key Features | Application |
|---|---|---|---|---|
| 1 | NH40-100/3 | Single-throw Isolating Switch | 100A rated current, 3-pole, internal cabinet standard handle, single input single output | Small workshop distribution cabinet main isolation switch |
| 2 | NH40-100/3SZ | PC-class Auto Transfer Switch | 100A, 3P, dual-power automatic switching, mechanical & electrical interlock | Building lighting, small equipment dual power supply backup |
| 3 | NH40-100/4 | Single-throw Isolating Switch | 100A, 4-pole three-phase four-wire, internal operation handle | Civil building 380V four-wire incoming isolation |
| 4 | NH40-100/4SZ | PC-class Dual-power ATS | 100A 4P auto transfer, break-before-make switching logic | Small commercial complex dual-power distribution system |
| 5 | NH40-125/3 | Manual Isolating Switch | 125A frame, 3P internal handle, support frequent load switching | Medium factory branch power isolation control |
| 6 | NH40-125/3SZ | 125A 3P Auto Transfer Switch | Automatic mains/standby switch, phase loss/overvoltage/undervoltage protection | Water pump station small dual-power backup control cabinet |
| 7 | NH40-125/4 | Four-pole Isolator | 125A 4P single throw, full pole isolation for neutral wire | Shopping mall low-voltage four-wire incoming cabinet |
| 8 | NH40-125/4SZ | 125A 4P Dual-power ATS | Four-wire automatic transfer, complete neutral line switching | Small data room, monitoring equipment dual power supply |
| 9 | NH40-1000/3 | Heavy-duty Isolating Switch | 1000A large current 3P, internal operation handle, only for isolation (no load breaking) | Large factory main power room circuit isolation maintenance |
| 10 | NH40-1000/3S | Double-throw Manual Changeover Switch | 1000A 3P S-type double throw, manual two-circuit switching without auto function | Temporary power supply manual conversion for heavy equipment |
| 11 | NH40-1000/3SZ | 1000A 3P PC-grade Auto Transfer Switch | Large current dual-power automatic switching, rigid interlock structure | Large refrigeration unit, mine auxiliary dual power system |
| 12 | NH40-1000/3W | External Handle Isolator | 1000A 3P, W=external cabinet long handle operation | Central distribution cabinet requiring external panel operation |
| 13 | NH40-1000/4 | 1000A Four-pole Isolator | 4P heavy single-throw isolating switch, full pole break for neutral wire | Large industrial plant four-wire total incoming isolation |
| 14 | NH40-1000/4SZ | 1000A 4P Heavy ATS | Four-wire large current automatic transfer, break-before-make safety design | Chemical factory continuous production equipment dual power backup |
| 15 | NH40-1250/3 | Ultra-large Current Isolator | 1250A 3P internal handle, dedicated for power isolation | Super large factory main power distribution room maintenance switch |
| 16 | NH40-1250/3SZ | 1250A 3P PC-class Auto Transfer Switch | Top small-frame heavy-duty dual-power automatic transfer unit | Central pump station, large HVAC dual power supply system |
| 17 | NH40-1250/3W | 1250A External Operation Isolator | W long shaft handle, operate switch outside cabinet door | High-voltage matching low-voltage main cabinet external control |
| 18 | NH40-1250/4 | 1250A Four-pole Heavy Isolator | 4P full pole isolation, thickened copper conductive busbar | Large commercial complex total four-wire power isolation |
| 19 | NH40-1250/4SZ | 1250A 4P Ultra-large ATS | Four-wire maximum specification of NH40SZ series, stable full-load auto switching | Hospital, data center, fire-fighting essential dual power load |
Product Overview
CHNT NH40 series complies with GB/T 14048.3 and IEC 60947-3 standards, divided into two functional branches: single/double-throw manual isolating switches and NH40SZ PC-grade automatic transfer switches.
Model Code Definition
- Number after hyphen: Rated working current (100A/125A/1000A/1250A)
- Middle digit: 3=3-pole three-phase; 4=4-pole three-phase four-wire
- S: Manual double-throw changeover switch; SZ: PC-class automatic dual-power transfer switch; W: Cabinet external long handle operation (no W = internal cabinet handle)
Core Product Features
-
Manual NH40 isolating switch Adopt spring energy storage quick-break mechanism and double-break rolling contacts, with clear visible break points to meet electrical maintenance isolation safety standards. 100A/125A models support frequent load switching under AC-23A category; 1000A/1250A ultra-large current versions are only used for static power isolation, prohibited from breaking live load. Optional internal standard handle and W-type external long shaft handle for flexible cabinet layout.
-
NH40SZ PC-grade automatic transfer switch Integrate mechanical + electrical dual interlock to avoid simultaneous conduction of two power sources; adopt break-before-make transfer logic to cut off load during switching, fully complying with fire-fighting and critical power supply requirements. Built-in phase loss, overvoltage, undervoltage detection, automatically switch between mains and standby power, with manual emergency switching function reserved.
Application Scenarios
The whole series is widely matched with fuses, moulded case circuit breakers and shunt capacitors, applied in industrial factory distribution rooms, commercial buildings, fire-fighting power systems, hospital data rooms, pump stations, metallurgy and mining low-voltage complete sets of cabinets, providing safe isolation and reliable dual-power backup solutions for all kinds of power distribution loops.
CHNT NH40 Series Switch Disconnectors & NH40SZ PC-class Automatic Transfer Switches
