In fire protection systems and data centers, "uninterrupted power supply" is the core bottom line — fire protection equipment is related to life and property safety, and data center operation determines business continuity and data security. Once a power outage occurs, it may not only aggravate fire losses and cause casualties, but also lead to data loss and business paralysis, resulting in significant economic losses. As a connecting "bridge" between the main and backup power supplies, the ATS double power switch can quickly and automatically switch when the main power supply fails, ensuring continuous power supply for key equipment and being an indispensable core power distribution equipment in both scenarios.
Not all ATS can adapt to the special needs of fire protection and data centers. Improper selection and non-standard installation will bury potential safety hazards. Combining the characteristics of the two scenarios, this article disassembles the ATS selection criteria and installation specifications, and recommends suitable high-reliability products to help practitioners avoid risks and achieve efficient deployment.
I. Clarify the Core First: The Core Role of ATS Double Power Switch in Two Scenarios
Before delving into selection and installation, it is necessary to clarify the core value of ATS in the two scenarios, which is the fundamental basis for subsequent work.
In fire protection systems, fires are likely to cause main power outages, and key equipment such as fire pumps, smoke exhaust fans, and emergency lighting need to rely on backup power for continuous operation. The core role of ATS is to automatically switch to the backup power supply at the moment the main power supply fails, ensuring that fire protection equipment works without interruption and gaining time for fire fighting and personnel evacuation. Its performance directly determines the fire emergency response capability.
The core loads of data centers, such as servers and storage, have extremely high requirements for power supply continuity. A power outage of a few seconds may cause data loss and business paralysis. As the emergency switching center of power distribution, ATS real-time monitors the status of the main power supply. Once an abnormality occurs, it immediately switches to the backup power supply to achieve seamless connection, ensuring the stable operation of core businesses and avoiding equipment damage.
It can be seen that the selection and installation of ATS are directly related to the reliability and continuity of the two scenarios, and must strictly follow industry standards and scenario requirements.
II. Core Focus: Selection Criteria for ATS Double Power Switch in Fire Protection/Data Centers (Must Read)
Fire protection and data centers are high-risk scenarios. ATS selection must take into account reliability, safety, adaptability and compliance. The following 4 core criteria are indispensable. Combined with the scenarios, selection suggestions are given for direct implementation.
⭕️ Core Selection Principle: Adapt to Scenario Needs and Prioritize Reliability
The core of selection is "adaptability". The two scenarios have different load and power supply requirements, but both need to give priority to products with high reliability, fast switching, compliance with standards and complete protection, and eliminate inferior ATS — which may have problems such as switching delay and failure, leading to safety accidents or business interruptions in emergency situations.
⭕️ 4 Core Selection Criteria, Check One by One to Avoid Pitfalls
✅️ Criterion 1: Meet Switching Performance Requirements to Satisfy Scenario Emergency Needs
Switching performance is the core indicator of ATS, which directly determines the duration of power outage and needs to be selected accurately according to the scenario:
1. Switching Time: For fire protection scenarios, according to GB 50974-2014, the automatic switching time of dual power supplies shall not exceed 2s, the emergency response time for high-risk places shall not exceed 0.25s, and the ATS supporting core fire protection equipment is recommended to be ≤ 500ms; for data center core loads, it is recommended to be ≤ 100ms, the key loads of core computer rooms shall use PC-level ATS ≤ 50ms, and the auxiliary loads shall be ≤ 300ms.
2. Switching Mode: Priority is given to the "automatic + manual" dual mode to adapt to emergency and operation and maintenance needs. For core data center scenarios, closed switching is recommended (total switching ≤ 50ms, phase difference ≤ 5°), and for fire protection scenarios, open switching (≤ 100ms) or closed switching can be selected according to the load.
3. Re-switching Function: Select the switchable mode of "automatic re-transfer + non-automatic re-transfer". For fire protection scenarios, automatic re-transfer is recommended to ensure stable daily power supply; for core data center scenarios, non-automatic re-transfer can be selected to avoid repeated switching caused by main power supply fluctuations.
✅️ Criterion 2: Match Rated Parameters, Taking into Account Load and Power Supply Characteristics
The rated parameters of ATS must be accurately matched with the power supply specifications and load capacity, otherwise it is easy to cause equipment damage or potential safety hazards. The core parameters are as follows:
1. Rated Voltage/Current: It must be consistent with the main and backup power supply specifications (most of the two scenarios are 380V three-phase), and the rated current is ≥ 1.25 times the total load current (PC level); the short-circuit withstand current of data centers is ≥ 30kA (208VAC) and ≥ 42kA (480VAC), and for fire protection scenarios, it shall be selected according to the load short-circuit current.
2. Load Adaptability: Most fire protection scenarios are inductive loads, so ATS that can withstand the starting inrush current shall be selected; most data centers are nonlinear loads, so ATS with neutral line current ≥ 200% of the rated current of phase contacts shall be selected, and it shall be compatible with UPS and generators.
3. Power Supply Adaptability: For the mains + generator mode, ATS with engine start contacts shall be selected; for the dual mains mode, ATS with dual monitoring of voltage/frequency shall be selected; for the mains + UPS mode, ATS with UPS auxiliary contacts shall be selected to limit the UPS charging current during switching.
✅️ Criterion 3: Complete Protection Functions to Avoid Safety Risks
The two scenarios have high safety requirements. ATS must have complete protection functions to avoid risks caused by power supply abnormalities in advance:
1. Core Protection: It must have overvoltage, undervoltage, phase loss, overload and short-circuit protection. Among them, the CB-level ATS for fire loads must have short-circuit protection and overload alarm, and overload power-off protection shall not be adopted.
2. Interlock Protection: It has mechanical + electrical double interlock to prevent two power supplies from being closed at the same time; the bypass ATS of data centers must have dual bypass function to ensure uninterrupted power supply during maintenance.
3. Monitoring and Alarm: It has power supply status monitoring, switching indication and fault alarm. For data center scenarios, it is recommended to select ATS with remote monitoring function, which can be connected to the BMS system to realize remote operation and maintenance.
✅️ Criterion 4: Compliance with Industry Standards and Certifications
The two scenarios are special industries. ATS must comply with national industry standards and have relevant certifications, otherwise it cannot pass the acceptance:
1. Industry Standards: It must comply with basic standards such as GB/T 14048.11 and GB 50052. For fire protection scenarios, it must additionally comply with fire protection standards such as GB 50974-2014, and for data centers, it must comply with the computer room requirements of GB/T 2887-2011.
2. Product Certification: ATS for fire protection scenarios must have CCCF mandatory certification; for data centers, it is recommended to select products with UL 1008 and CE certifications. The manufacturer must have ISO 9001 certification and more than 2 years of scenario application cases.
⭕️ Scenario-based Selection Suggestions for Direct Application
1. Fire Protection Scenarios: Priority is given to PC-level or CB-level ATS (CB-level is selected for small capacity without independent protection), with switching time ≤ 2s, CCCF certification, double interlock and complete protection, adapting to inductive loads, and the installation position meets the requirements of GB 55037-2022.
2. Data Center Scenarios: For core loads, priority is given to PC-level + closed switching + dual bypass ATS (switching ≤ 50ms); for auxiliary loads, PC-level + open switching + single bypass ATS (≤ 300ms) is selected; for small capacity loads, CB-level can be selected; N+1 redundancy configuration is recommended for core computer rooms.
III. Key Link: Installation Specifications of ATS Double Power Switch in Fire Protection/Data Centers
Selecting the right ATS is only the first step. Standard installation is the key to ensuring its normal operation. It is necessary to follow industry standards and product requirements, focus on the following 5 links, and avoid equipment failures, potential safety hazards or failure to pass acceptance.
⭕️ Pre-installation Preparation: Troubleshoot Hidden Dangers and Ensure Adaptability
1. Equipment Inspection: Check that the ATS model and parameters are consistent with the selection requirements, the appearance is intact, the certifications are complete, the internal wiring is firm, and the contacts are clean and free of oxidation.
2. On-site Preparation: Clean the installation site to ensure it is flat, dry and ventilated, away from dangerous interference sources; fire protection scenarios need to be independently installed in metal boxes, and the distance between the data center computer room and other equipment is ≥ 300mm. At the same time, check that the power supply and load are matched with the ATS parameters.
⭕️ Installation Position: Accurate Positioning to Meet Scenario Requirements
1. Fire Protection Scenarios: ATS is installed in the last-level distribution box of the fire protection equipment power distribution circuit, close to the load, with an installation height of 1.2-1.5m, avoiding moisture and collision. A rain shelter is required for outdoor installation, and a constant temperature heater is equipped for humid areas.
2. Data Center Scenarios: ATS is installed in the power distribution room, and the ATS for core loads is close to the equipment; ≥ 630A is installed on the ground, ≤ 400A is installed on the wall, with a horizontal inclination ≤ 1°. The floor-mounted installation must be fixed firmly, with a reserved operation and maintenance space of ≥ 80cm.
⭕️ Wiring Specifications: Rigorous Operation to Avoid Wiring Errors
Wiring is the core link. Incorrect wiring is likely to cause failures or accidents, and the following requirements must be strictly followed:
1. Wiring Materials: Select national standard fire-resistant and flame-retardant materials. Fire-resistant cables are used for fire protection scenarios, and copper core cables are recommended for data centers. The cross-section of the conductor matches the rated current of ATS, and the cross-section of the grounding wire is ≥ 1/2 of the phase wire.
2. Wiring Operation: Distinguish the main and backup power supply and load terminals according to the manual, the wiring is firm (M10 bolt ≥ 30N·m), the phase sequence of the main and backup power supplies is consistent, and the four-pole switch is used for TN-C-S and TN-S systems to cut off the phase conductor and neutral conductor at the same time.
3. Grounding Specifications: The ATS shell and bracket are reliably grounded, the grounding resistance is < 4Ω, and the grounding wire is firmly connected to avoid virtual connection and missing connection.
4. Insulation Requirements: After wiring, clean up the sundries, the wire insulation is intact, the electrical clearance is ≥ 12mm, the creepage distance is ≥ 15mm (380V), and the insulation resistance between phases and phase to ground is > 100MΩ tested by a 500V megohmmeter.
⭕️ Commissioning and Trial Operation: Comprehensive Inspection to Ensure Normal Operation
After installation, comprehensive commissioning and trial operation are required to confirm that the ATS function is normal. The steps are as follows:
1. No-load Commissioning: Disconnect the load, connect the main and backup power supplies, test the switching function, interlock function and alarm function, and confirm that the switching time meets the standard.
2. Load Trial Operation: Connect the load for full-load operation for ≥ 24 hours, monitor the operation status, simulate the main power failure to test the switching stability, and test the automatic re-transfer function (if enabled) after the main power supply is restored.
3. Data Recording: Record parameters such as switching time, current and voltage to form a commissioning report; test the linkage function between ATS and BMS system in data centers.
⭕️ Post-maintenance: Regular Inspection to Extend Equipment Life
A regular inspection system must be established to ensure the long-term stable operation of ATS:
1. Daily Inspection: Check the ATS status indication, whether there is abnormal noise and heating every day, and confirm that the wiring and grounding are firm.
2. Regular Detection: Manually switch to verify the function every quarter, clean the contacts and check the wearing parts every six months, and test the switching, protection, alarm functions, insulation and contact resistance every year.
3. Fault Handling: Immediately shut down and troubleshoot when a fault is found, and it is strictly prohibited to operate with faults; the ATS fault in fire protection scenarios shall be repaired in time, and the data center shall do a good job in redundancy backup.
IV. Adaptation Recommendation: Special ATS Double Power Switch for Fire Protection/Data Centers (People Electric RDQ1 Series)
Combined with the above selection criteria and installation specifications, the People Electric RDQ1 Series ATS suitable for the two scenarios is recommended. This product complies with national industry standards, with complete functions and excellent performance, and is the core recommended product of the independent station.
The People Electric RDQ1 Series ATS is specially designed for fire protection and data centers, and its core advantages are in line with the selection criteria, as follows:
1. Excellent Switching Performance: The fastest switching time is 50ms, meeting the needs of the two scenarios, supporting automatic + manual dual mode and two switching modes, and the re-switching mode can be flexibly switched.
2. Strong Parameter Matching: The rated voltage is 380V three-phase, the current covers 20A-6300A (PC level) and 16A-1250A (CB level), the short-circuit withstand current is ≥ 30kA, adapting to various loads and power supply modes, with strong compatibility.
3. Complete Protection Functions: It has comprehensive protection functions, the fire protection model has CCCF certification, the core model has double interlock, and the data center model supports remote monitoring, which can be connected to the BMS system.
4. Compliance with Standards: It complies with a number of national industry standards, has CCCF, UL 1008 and other certifications, the manufacturer has ISO 9001 certification and more than 2 years of scenario application cases, and can pass the acceptance smoothly.
5. Convenient Installation and Maintenance: It supports floor-mounted and wall-mounted installation, with convenient wiring and clear identification, compact structure, quick replacement of wearing parts, high shell protection level, and adaptation to different environments.
This series of ATS is perfectly suitable for the two scenarios. For detailed parameters and quotations, you can visit the independent station product page: www.people-electric.com/rdq1（ats）-product/, or consult the professional team for selection and installation guidance.
V. Summary: Double Check on Selection and Installation to Build a Solid Line of Defense for Power Supply Safety
ATS is the "emergency line of defense" for fire protection and data centers. The selection must follow the principles of "adaptability, compliance, and reliability", and accurately match with the four core criteria; the installation must do a good job in preparation, positioning, wiring, commissioning and maintenance to ensure the normal operation of the equipment.
The People Electric RDQ1 Series ATS accurately meets the core needs of fire protection and data centers, providing professional support from selection to installation to help you build a solid line of defense for power supply safety.
If you encounter any problems in the selection and installation of ATS double power switch, welcome to visit our website. We will provide you with one-on-one professional solutions to help you achieve efficient and safe deployment.
Post time: May-16-2026
