Dual Power Automatic Transfer Switch AC 400V 16A–630A

Name: Dual Power Automatic Transfer Switch ATS - ETEK Electri
SKU: EKS2T

The EKS2T dual power automatic transfer switch is a PC class ATS for AC 50/60Hz, 400V systems from 16A to 630A. It switches reliably between grid, backup or generator supplies, supports fire linkage, and protects hospitals, banks and high-rise buildings from power loss.

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ModelEKS2T

CategoryAutomatic Transfer Switches, Solar Transfer Switch

AvailabilityIn stock

CE & TUV certified
Worldwide shipping
OEM & ODM support

Product Features of Dual Power Automatic Transfer Switch

This dual power automatic transfer switch is a PC grade (three-sectional) automatic conversion switchgear that switches between two power supplies when an abnormality occurs on one of them, protecting the reliability and safety of the power supply.

Three working positions: common (I) switch-in, standby (II) switch-in, and disconnection (0), which also supports fire linkage and infrequent on-off power systems.
Five controller types (A to E): A basic type, B firefighting type, and C/D/E intelligent types, so the switch can be matched to simple or complex projects.
Manual and automatic operation: manual rotating wheel plus a manual/automatic toggle switch; remote control is available on the higher-spec controllers.
Flexible conversion modes: self-throwing self-resetting (default) or self-throwing non-self-resetting for mutual backup between two grids.
Adjustable protection (Types B to E): under-voltage conversion 165–217V, over-voltage conversion 243–298V, voltage measuring range 4–300V, and under/over-frequency detection at 40–60Hz.
Adjustable delays: conversion delay and return delay, both continuously adjustable from 0 to 180 s.
Generator and fire control: one set of relay dry contacts for generator start, plus firefighting forced-setting “0” with one passive contact input and one N.O. passive signal feedback.
Phase-loss detection: three-phase (A, B, C) detection on advanced controllers; Type A monitors three phases on the common supply and a single phase on the backup supply.
Clear status indication: LED status display, with an LCD screen option on the intelligent controllers; mechanical position indicator on the switch body.
Communication and installation options: RS485 communication on Type D/E controllers; integrated type (no display screen) or split type (with display screen).

Part	Function
Common power supply I at incoming end	Incoming terminals for the common (main) source
Common power supply II at incoming end	Incoming terminals for the standby (backup) source
Mechanical indication	Shows the current switch position
Load connection terminal	Output terminals to the load
Manual operation rotating wheel	Manual switching between I, 0 and II
Manual / automatic toggle switch	Selects manual or automatic operation
Switch status indicator	Shows the working state of the switch
Product information	Nameplate: model, Ue, Ie, Uimp, Iq, PC class AC-33iB

Commercial Applications of Dual Power Automatic Transfer Switch

Where a power cutout is not allowed, a dual power automatic transfer switch keeps critical loads running by moving automatically to the healthy supply. The EKS2T is mainly applied in hospitals, shopping malls, banks, chemical plants, metallurgical plants, high-rise buildings, military facilities, and firefighting systems.

Applications & Use Cases

Hospitals and medical facilities: continuous supply to life-critical equipment, with automatic changeover from mains to backup.
Banks and shopping malls: uninterrupted power for security, lighting, payment, and control systems.
Chemical and metallurgical plants: reliable supply for continuous-process equipment where an outage is a safety or production risk.
High-rise buildings and firefighting: fire-linkage control forces the switch to the “0” position through a passive contact input; the generator start signal is available through relay dry contacts.
Military facilities: dependable supply switching for important sites where power cutout is not allowed.
Grid to grid: Power supply I priority (self-throwing, self-resetting, A-9-001) or mutual backup (self-throwing, non-self-resetting, A-9-000).
Grid to generator: the switch starts the generator signal on grid failure, waits for the generator warm-up delay, transfers to supply II, and returns to the grid after recovery.

Technical Specifications of Dual Power Automatic Transfer Switch

The table below lists the main electrical data of this dual power automatic transfer switch, designed for IEC60947-6-1 for AC 50/60Hz power systems.

Electrical Data

Parameter	EKS2T-125	EKS2T-250	EKS2T-630
Rated working current (Ie)	16, 20, 32, 40, 50, 63, 80, 100, 125A	125, 160, 200, 225, 250A	250, 315, 350, 400, 500, 630A
Rated power supply voltage (Us)	AC 230V	AC 230V	AC 230V
Rated insulation voltage (Ui)	800V	800V	800V
Rated impulse withstand voltage (Uimp)	8kV	8kV	8kV
Rated short-circuit making capacity	17kA peak	26kA peak (see note)	26kA peak (see note)
Rated limited short-circuit current (Iq)	120kA	120kA	120kA
Contact conversion time	0.58s	0.56s	0.9s
Conversion action time	1.35s	1.3s	2.0s

Controller Functions

Function	Details by controller type
Rated control power supply	AC 230V 50/60Hz (all types)
Auxiliary working voltage	None on Type A/B; DC 24V on Type C/D/E
Voltage measuring range	4–300V (Types B to E)
Working positions	Three: common switch-in, backup switch-in, both switch-off
Way of operation	Manual, automatic; remote control on higher types
Way of display	LED status display; LCD screen on intelligent types
Way of conversion	Self-throwing self-resetting (default); self-throwing non-self-resetting optional
Under-voltage / over-voltage conversion	165–217V / 243–298V adjustable
Under-frequency / over-frequency detection	40–60Hz adjustable
Timing start function	Timing conversion / timing start generator
Conversion delay / return delay	0–180s continuously adjustable
Phase-loss detection	Type A: common three phases, backup single phase; advanced types: three phases (A, B, C)
Generator control	One set of relay dry contacts (Types B to E)
Firefighting linkage control	Forced setting “0”: one passive contact input, one N.O. passive signal feedback
Communication	RS485 on Type D/E; default none, optional
Way of installation	Integrated (no display screen) or split (with display screen)

Normal Working Conditions

Item	Requirement
Ambient temperature	-5°C to +40°C; 24-hour average not above +35°C
Relative humidity	Max 50% at +40°C; monthly maximum 90% at lower temperatures
Altitude	Not exceeding 2000 meters
Pollution level	Level 3
Usage category	AC-33iB
Electromagnetic environment	Environment A (protective measures needed in environment B)
Standard	IEC60947-6-1

Dimensions and Wiring of Dual Power Automatic Transfer Switch

Check the installation and handle space sizes below before mounting this dual power automatic transfer switch, and use the terminal definitions to wire each controller type correctly.

Dimensions (mm)

Dual Power Automatic Transfer Switch

Dimension	125	250	630/3P	630/4P
External dimension
A	242	315	417	475
B	120	170	230	230
H	115	146	202	202
Installation dimension
A1	116	298.5	386.5	444.5
B2	106	155	203	203
H1	15.5	20	16.5	16.5
H2	33	44	62	62
H3	82.2	101	130	130
L1	18.5	26	48	48
L2	19	24	32.6	32.6
C	83	121	173	173
E	21	25	27	27
V	16.6	22	45.5	45.5
P	25	35	58	58
D	Φ4.5	Φ6.3	Φ8.5	Φ8.5
M	M6	M8	M10	M10
Handle space size
G	196	246	305	305
R	106	137	163	163
Q	194	235	240	240

Definition of Terminal

Terminal numbers for each controller type. “✓” means the terminal is present on that controller.

Terminal	Function	Type A	Type B	Type C	Type D/E
101	Common zero-line	✓	✓	✓	✓
102	Common power supply	✓	✓	✓	✓
103	Common switch-in	✓	✓	✓	✓
201	Backup zero-line	✓	✓	✓	✓
202	Backup power supply	✓	✓	✓	✓
203	Backup switch-in	✓	✓	✓	✓
301	DC24V+	—	—	✓	✓
302	DC24V-	—	—	✓	✓
401 / 402	Firefighting passive input	—	✓	✓	✓
403 / 404	Firefighting passive output	—	✓	✓	✓
501	NO end of generator	—	✓	✓	✓
502	Common end of generator	—	✓	✓	✓
503	NC end of generator	—	✓	✓	✓
601	RS485 A+	—	—	—	✓
602	RS485 B-	—	—	—	✓
603	RS485 GND	—	—	—	✓