Customized Automatic Transfer Switch Distribution Control Box

Dual-Power Seamless Transfer | Microprocessor-Controlled | OEM/ODM Supported

What This Box Does

This is a dual-power automatic transfer control enclosure that monitors two independent power sources - typically utility mains + backup generator, or mains + UPS - and switches the load between them without human intervention.

When the primary source fails, the controller detects the voltage drop, starts the backup source, and transfers the load. When mains returns, it switches back to primary and shuts down the backup. The entire sequence is automatic, programmable, and logged.

Unlike off-the-shelf ATS units that force you to adapt your system to their logic, this box is built around your control requirements.

Who Needs This

User Type	Typical Setup	Why Custom Matters
Hospital & Healthcare	Mains + Diesel Generator + UPS	Patient life support cannot tolerate transfer delays > 50ms
Data Center	Dual utility feeds + Battery backup	Rack-level ATS with SNMP monitoring and remote dry contacts
Industrial Plant	Grid + Cogeneration / Solar + Grid	Need phase synchronization before closing on generator
Telecom Tower	Grid + Battery + Solar	Outdoor IP65, -40°C operation, GSM alarm module
Commercial Building	Mains + Standby Generator	Fire panel integration, elevator priority circuit
Marine / Offshore	Shore power + Ship Generator	ABS/DNV certification, salt spray resistant

Transfer Logic (Programmable)

Parameter	Default	Adjustable Range
Undervoltage Trip	85% of nominal	70%–95%
Overvoltage Trip	110% of nominal	105%–130%
Underfrequency Trip	47Hz (50Hz system)	45–49Hz
Transfer Delay (Normal → Emergency)	3 seconds	0–300 seconds
Re-transfer Delay (Emergency → Normal)	10 minutes	0–60 minutes
Generator Start Delay	0 seconds	0–60 seconds
Generator Cool-down	5 minutes	0–30 minutes

Hardware Architecture

Enclosure Options

Grade	Material	Protection	Application
Standard	Cold-rolled steel, 1.5mm	IP42	Indoor, clean environment
Industrial	Cold-rolled steel, 2.0mm + powder coat	IP54	Dusty, light moisture
Outdoor	304 Stainless steel, 2.0mm	IP65	Rain, direct sun, -40°C to +60°C
Marine	316 Stainless steel, 2.5mm	IP66	Salt spray, offshore platforms

Controller Specifications

Feature	Specification
Processor	ARM Cortex-M4, 32-bit, 72MHz
Display	4.3" color TFT LCD (optional) / LED status indicators (standard)
Inputs	3-phase voltage × 2 sources, 3-phase current × 1 load, 8 digital inputs
Outputs	6 relay outputs (configurable), 2 analog outputs (4–20mA)
Communication	RS485 (Modbus RTU), RS232, Ethernet (Modbus TCP/IP optional)
Data Logging	10,000 events, SD card expansion
Power Supply	AC/DC 85–265V universal

Transfer Performance

Transfer Type	Typical Time	Suitability
Open Transition (Break-Before-Make)	50–200ms	Standard loads, most common
Delayed Transition	2–5 seconds	Motor loads, inductive loads
Closed Transition (Make-Before-Break)	< 50ms	Critical loads, hospital ICU
Soft Load Transfer	Synchronized	Parallel operation, cogeneration

Closed transition requires phase angle synchronization within ±5° and voltage difference < 5%. Our controller supports this with optional synchrocheck relay.

Customization Capabilities

This is where this product diverges from catalog ATS units. We build the control logic around your sequence of operations.

Standard Customization (No NRE)

Option	Description
Voltage Range	208V, 380V, 415V, 480V, 600V
Frequency	50Hz / 60Hz / 400Hz (aircraft)
Current Rating	63A – 6300A (contactor or breaker-based)
Control Voltage	AC 220V, DC 24V, DC 48V, DC 110V
Communication Protocol	Modbus RTU/TCP, BACnet, SNMP, DNP3
Language	English, Spanish, Arabic, Chinese, Russian

Engineered Customization (With NRE)

Option	Use Case
Multi-source logic	3+ sources with priority ranking
Load shedding sequence	Non-critical load disconnect on overload
Generator auto-start with pre-lube	Large diesel genset protection
Fire panel integration	NFPA 110 compliance, elevator recall
Parallel synchronization	Multiple generators load sharing
Remote SCADA integration	Cloud monitoring, mobile app alerts
Explosion-proof enclosure	Oil & gas, chemical plants (ATEX/IECEx)

Compliance & Certification

Standard	Scope
IEC 60947-6-1	Automatic transfer switching equipment
GB/T 14048.11	Chinese national standard for ATS
NFPA 110	Emergency and standby power systems (U.S.)
ISO 8528	Reciprocating internal combustion engine driven alternating current generating sets
CE Marking	European conformity
UL 1008	Transfer switch safety (available on request)

How to Order

Because every unit is customized, we do not sell from stock. The specification process:

Step 1: Fill in the application questionnaire

Load type and rating

Source configuration (mains/gen/UPS/solar - how many, what voltage)

Transfer time requirement

Environmental conditions

Monitoring/communication needs

Step 2: We return a control logic diagram and BOM within 48 hours

Step 3: Approve drawing, confirm lead time and price

Step 4: Production (typically 15–25 working days depending on complexity)

Step 5: Factory acceptance test (FAT) with video documentation

Step 6: Shipping and commissioning support

Lead Time & Pricing

Complexity	Typical Lead Time	MOQ
Standard customization	15–20 working days	1 unit
Engineered customization	25–40 working days	1 unit
Large project (50+ units)	Confirm with project manager	10 units

Pricing is project-specific. A 100A standard indoor unit starts competitive; a 3200A closed-transition marine-rated unit with synchrocheck and SCADA integration is priced accordingly. We do not publish a price list because the range is too wide to be meaningful.

Why Custom ATS Instead of Off-the-Shelf

Factor	Catalog ATS Unit	Our Custom ATS Control Box
Control logic	Fixed, manufacturer-defined	Programmable to your sequence
Enclosure	Standard sizes only	Any dimension, any material
Communication	Basic Modbus if lucky	Protocol of your choice
Integration	You adapt your system to the ATS	ATS adapts to your system
Spare parts	Proprietary, long lead times	Standard industrial components
Documentation	Generic manual	Project-specific drawings and logic

Related Products

GGD Low-Voltage Fixed Power Distribution Cabinet

GGJ Intelligent Capacitor Compensation Cabinet

XL-21 Power Distribution Box

Custom Motor Control Center (MCC)

Request a Custom Specification

[Download Application Questionnaire (PDF)]

Or email your requirements directly. Include:

Single-line diagram (if available)

Load schedule

Source specifications

Environmental conditions

Any special integration requirements

We respond to all inquiries within 24 hours.

SEO Configuration

Element	Content
Title Tag	Customized Automatic Transfer Switch Distribution Control Box	OEM ATS Manufacturer
Meta Description	Custom-built automatic transfer switch control boxes for dual-power systems. Programmable logic, microprocessor control, 63A–6300A. OEM/ODM supported. Request custom spec.
URL Slug	/products/customized-automatic-transfer-switch-distribution-control-box
Primary Keywords	automatic transfer switch, ATS control box, dual power transfer switch, customized ATS, generator transfer switch
Secondary Keywords	automatic transfer switch manufacturer, custom ATS enclosure, microprocessor controlled ATS, dual source power transfer
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Internal Links	Link to GGD cabinet, GGJ compensation, XL-21 box, custom MCC