Products catalog

Home/Product Catalog/Solar Energy Generation and Management Equipment/Solar Power Plant Balancing | Automation Control | Analysis | Monitoring/Backup power transfer switches for generators (ATS / MTS)
  • New item   Automatic transfer switch ATS CHINT NXZ-250/4 | 4P | 250 A | 400/415 V | PC class
    New item   Automatic transfer switch ATS CHINT NXZ-250/4 | 4P | 250 A | 400/415 V | PC class 1
    New item   Automatic transfer switch ATS CHINT NXZ-250/4 | 4P | 250 A | 400/415 V | PC class 2
    New item   Automatic transfer switch ATS CHINT NXZ-250/4 | 4P | 250 A | 400/415 V | PC class 3

    Automatic transfer switch ATS CHINT NXZ-250/4 | 4P | 250 A | 400/415 V | PC class

    Code: ES-NXZ-250/4P
    Inquire about this item
    Price 835.61 € VAT incl.
    ( 690.59 € VAT excl. )

    CHINT NXZ-250/4 – 4P automatic transfer switch 250 A for a three-phase 400/415 V system with two power sources. PC class: withstands short-circuit current (Iq 100 kA), protection is installed upstream.

  • Product description

    Automatic transfer switch ATS CHINT NXZ-250/4 | 4P | 250 A | 400/415 V | PC class

    CHINT NXZ-250/4 is automatic transfer switching equipment (ATS) that transfers the load to a backup source – a second grid supply or a generator – when the main supply fails or goes out of limits. 4P, rated current 250 A, operating voltage 400/415 V, 50 Hz.

    Key point:
    A PC class ATS transfers the sources and withstands short-circuit current (conditional Iq 100 kA, Icw 10 kA / 0.2 s) but does not break it. Overload and short-circuit protection is provided by circuit breakers or fuses installed upstream.
    Poles / current
    4P / 250 A
    Class (IEC 60947-6-1)
    PC
    Transfer time
    2.1 s ±10 %
    Utilisation category
    AC-33B

    How it works

    The controller continuously measures the voltage of both sources. If a phase is lost or the voltage leaves the set limits (undervoltage – default 187 V, adjustable 160–200 V; overvoltage – 263 V, adjustable 240–290 V), after the set delay the ATS disconnects the main source and connects the backup.

    The controller has three modes: grid–grid with automatic return, grid–grid without automatic return and grid–generator. Transfer, return, generator start and stop delays are adjustable 0–300 s (default 5 s).

    In grid–generator mode the generator start contact (502–503) closes when the main source fails. The B type controller also has RS485 (Modbus) communication. Sources are connected at the top, the load at the bottom.

    Why choose CHINT NXZ-250/4?
    A switch with a built-in controller: transfers the sources by voltage, prevents them from being connected together and can start a generator.

    Technical specifications

    Product type Automatic transfer switching equipment (ATS), PC class
    Manufacturer / model CHINT, NXZ-250/4 250 A
    Poles 4P
    Rated current In 250 A (frame 250 A)
    Operating voltage Ue 400/415 V, 50 Hz
    Insulation voltage Ui AC 800 V
    Impulse withstand voltage Uimp 8 kV
    Utilisation category AC-33B
    Conditional short-circuit current Iq 100 kA
    Short-circuit making capacity Icm 30 kA
    Short-time withstand current Icw (0.2 s) 10 kA
    Transfer time contacts 1 ±10 % s; operating 2.1 s ±10 %
    Endurance mechanical 7 000, electrical 1 000 cycles
    Controller supply Us 230/240 V, 50/60 Hz; 85–110 %
    Controller A (standard) or B (intelligent); integrated or split mounting
    Voltage limits undervoltage 160–200 V (187 V), overvoltage 240–290 V (263 V)
    Delays 0–300 s (default 5 s)
    Communication RS485, Modbus (B type controller)
    Dimensions (W × H × D) 295 × 175 × 175 mm
    Operating conditions −5…+40 °C, up to 2000 m, pollution degree 3
    Standards IEC 60947-1, IEC 60947-6-1
    Data according to the CHINT NXZ catalogue. The controller type (A or B) is shown on the product label – please confirm before ordering.

    Key functions

    • Automatic transfer – on phase loss, undervoltage or overvoltage.
    • Three modes – grid–grid with or without return, grid–generator.
    • Generator start contact – 502–503, delays 0–300 s.
    • Manual operation, position 0, padlocking – for a Φ5–8 mm padlock.
    • Fire-control input and RS485 – RS485 only with the B type controller.

    How does it differ from similar switches?

    • CHINT NXZ-125/4 125 A – lower rated current – 125 A.
    • CHINT NXZ-630/4 630 A – higher rated current – 630 A.
    • CHINT NXZM (CB class) – with built-in circuit breakers, short-circuit protection inside.
    • Modular DIN ATS up to 125 A – for homes and small sites; CHINT NXZ – for switchboards and higher currents.

    Where is it used?

    • Main switchboards of industrial and commercial buildings – dual supply backup.
    • Sites with a backup generator – factories, warehouses, farms.
    • Hospitals, server rooms, telecom nodes – where a power interruption is costly.
    • High-rise buildings – supply of fire safety systems, fire-control input.
    • Residential houses – three-phase supply with a generator.

    Use by need

    For switchboard builders.
    A factory-made ATS with controller – less mounting and commissioning.
    For power engineers.
    Dual supply or grid–generator backup with adjustable limits and delays.
    For building owners.
    Power is restored automatically – without human intervention.

    Practical use

    Example: a site supply up to 250 A and a backup generator. The ATS is mounted in the switchboard between the supply and load busbars with the manufacturer-specified protection upstream, the controller is set to grid–generator mode and the generator remote start input is connected to contact 502–503. When the grid fails the generator starts, and the load is transferred only when its voltage reaches the set limits.

    Advantages

    • High conditional short-circuit current – Iq 100 kA.
    • Transfer – 2.1 s ±10 %.
    • Generator start contact.
    • Compact – 295 × 175 × 175 mm.
    • Mechanical endurance – 7 000 cycles.

    Disadvantages / limitations

    • No short-circuit protection – protection is needed upstream.
    • There is a short interruption during transfer – this is not a UPS.
    • Catalogue versions – 4P.
    • The controller needs a correctly connected N – a mistake can damage it.

    Safety and installation notes

    • Before work, disconnect both sources and switch the controller to manual mode – the ATS can transfer automatically.
    • Upstream of the ATS install the manufacturer-specified short-circuit protection.
    • Phase sequence and N – the manufacturer warns that a wrongly connected N can burn the controller.
    • Sources are connected at the top, the load at the bottom; vertical or horizontal mounting.
    • Select cables and busbars for 250 A and the manufacturer's terminal dimensions.
    • Installation by a qualified electrician; the generator N–PE bond according to the site earthing system.
    ☝ Elsprendimai.eu recommends: ATS selection guide · Diagrams: 3P or 4P · Ask for selection

    Quick selection guide

    Choose CHINT NXZ-250/4 if the supply is up to 250 A, the system is 400/415 V and short-circuit protection is already provided upstream of the switch.

    4P · 250 A
    400/415 V
    PC · IEC 60947-6-1
    AC-33B
    Suitable when you need:
    • dual supply or grid–generator backup up to 250 A;
    • a three-phase 400/415 V system with N switching (4P);
    • a generator start contact.
    Check before use:
    • the protection installed upstream of the ATS;
    • the controller type – RS485 only with B;
    • switchboard space and cable cross-section for 250 A.
    Important: An ATS does not replace a design – the number of poles, protection and generator connection are confirmed by the designer.

    FAQ

    Can CHINT NXZ-250/4 start a generator?
    Yes – in grid–generator mode contact 502–503 closes when the main source fails; it is connected to the generator remote start input.
    How long does the transfer take?
    Contact transfer time is 1 ±10 % s, operating transfer time 2.1 s ±10 %, plus the set delay (0–300 s).
    Is protection needed upstream of the ATS?
    Yes. A PC class ATS withstands short-circuit current (Iq 100 kA) but does not break it – manufacturer-specified circuit breakers or fuses are installed upstream.
    What voltage limits can be set?
    Undervoltage – 160–200 V (default 187 V), overvoltage – 240–290 V (default 263 V).
    Why 4P?
    4P also switches the neutral – the grid and generator N are not connected together and RCDs work correctly.
    Can it be controlled remotely?
    The B type controller has an RS485 (Modbus) interface – status and parameters can be sent to the building management system.

    Automatic transfer switch ATS CHINT NXZ-250/4 | 4P | 250 A | 400/415 V | PC class

    CHINT NXZ-250/4 – PC class 4P automatic transfer switch 250 A for 400/415 V systems with two sources: adjustable voltage limits, delays, generator start contact and three operating modes.

    Illustrative image may have been created using AI. The appearance of the product may differ slightly from the image shown. Please refer to the technical specification.

  • Alternative products

    Network plug | RJ45 connector (8P8C) | for UTP CAT 6e cable | unshielded | through-plug | transparent Network plug | RJ45 connector (8P8C) | for UTP CAT 6e cable | unshielded | through-plug | transparent  
    Network plug | RJ45 connector (8P8C) | for UTP CAT 6e cable | unshielded | through-plug | transparent
    Code: WT117

    This RJ45 Cat.6 UTP modular plug is a high-quality 8P8C unshielded network connector type, designed for Cat.6 UTP (Unshielded Twisted Pair) cables. The special straight-through design makes cable termination easier and more convenient, as the wires can be threaded through the plug, allowing a visual check of the wire arrangement before crimping the connector.

    Price 0.20 € VAT incl.
    ( 0.17 € VAT excl. )
    Add to cart 
    Cable for solar modules | 1x4mm² | black | H1Z2Z2K | Dca | SOLAR IEMMEQU HAR  
    Cable for solar modules | 1x4mm² | black | H1Z2Z2K | Dca | SOLAR IEMMEQU HAR
    Code: H1Z2Z2K

    The cable is designed for connecting photovoltaic (solar energy) systems and interconnecting solar modules. This cable offers excellent resistance to ultraviolet (UV) rays, ozone, atmospheric effects, and temperature fluctuations. A durable and flexible single-core copper cable with double insulation ensures long service life and safe use even in the most challenging outdoor conditions. Suitable for installation both indoors and outdoors.

    Price 0.98 € VAT incl.
    ( 0.81 € VAT excl. )
    Add to cart 
    U-FTP Cable | 6A CAT | 4x2x23 AWG | shielded | copper | UV resistant | outdoor use | black U-FTP Cable | 6A CAT | 4x2x23 AWG | shielded | copper | UV resistant | outdoor use | black  
    U-FTP Cable | 6A CAT | 4x2x23 AWG | shielded | copper | UV resistant | outdoor use | black
    Code: KIF6AOUTS500

    The U/FTP cable is a high-quality four-pair data transmission cable designed for telecommunication, industrial, and outdoor network installations. This cable is 100% copper, ensuring maximum signal transmission efficiency and minimal signal attenuation.

    It is adapted for 10 Gigabit Ethernet (10GBASE-T) data transmission at speeds of up to 10,000 Mbps and provides high electromagnetic resistance, as each pair is shielded with aluminum foil. Thanks to the PE outer layer, the cable is resistant to moisture, UV radiation, and mechanical impact, making it ideal for outdoor installations. 

    Price 0.73 € VAT incl.
    ( 0.60 € VAT excl. )
    Add to cart 

  • Subscribtion to new arrivals

    privacy policy

    Information