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Three Phase Relay Control
-- Steady & Reliable Manufacturer --
Introduction
Three phase relay control systems manage switching operations in three-phase electrical distribution networks, providing coordinated control of loads across all three phases. These relays are designed for applications requiring simultaneous switching of multiple phases, including motor control, power distribution, and industrial equipment. Huajin's three phase relays are available in 3-pole configurations with contact ratings from 10A to 60A per pole, supporting 400 VAC and 480 VAC systems. The relays incorporate magnetic latching technology, eliminating coil power consumption after switching and reducing heat in control cabinets. An interlocking mechanism ensures simultaneous operation of all poles, preventing phase imbalance conditions. Mechanical life exceeds 1,000,000 operations, with electrical life of ≥ 50,000 cycles at rated load per pole. The relays comply with IEC 60947-4-1 standards for low-voltage switchgear and controlgear.
Huajin Technology — Three Phase Relay Manufacturer
Huajin Technology Jiaxing Co., Ltd. manufactures three phase relay control systems for industrial and commercial electrical applications. The company operates from an 8,000-square-meter facility in Jiaxing City with over 120 employees, producing more than 10 million relays annually. ISO9001-2015 certification, TUV certification, and CCC certification ensure product quality and compliance for global distribution. Huajin supplies three phase relays to motor control centers, power distribution panel builders, and industrial equipment OEMs.
Specifications
| Parameter | Specification |
|---|---|
| Number of Poles | 3-pole (3P), 4-pole (3P+N) options |
| Contact Configuration | 3A (3 x SPST-NO), 3C (3 x SPDT) |
| Contact Material | Silver Tin Oxide (AgSnO2) |
| Rated Current per Pole | 10A, 20A, 30A, 40A, 60A |
| Rated Voltage (AC) | 400 VAC, 480 VAC, 690 VAC |
| Coil Voltage Options | 12V, 24V, 48V, 110V, 220V DC |
| Electrical Endurance | ≥ 50,000 operations at rated load |
| Mechanical Endurance | ≥ 1,000,000 operations |
| Coil Power Consumption | Approx. 1.5W – 3.0W (latching pulse) |
| Dielectric Strength (Coil to Contact) | 2500 VAC / 1 minute |
| Inter-pole Isolation | ≥ 1500 VAC |
| Operating Temperature | -25°C to +70°C |
| Safety Approvals | TUV, CCC, CE |
Applications
- Three phase motor starting and stopping
- Power distribution and feeder switching
- HVAC systems and compressor control
- Industrial machinery and production equipment
- Uninterruptible power supply (UPS) bypass switching
Advantages
- Simultaneous three-phase switching eliminates phase imbalance
- Zero standby power consumption with latching design
- Wide current range (10A–60A per pole)
- High dielectric strength for industrial safety
- Multiple coil voltage options for system compatibility
Frequently Asked Questions
What is the difference between 3-pole and 4-pole configurations?
3-pole relays switch three phase conductors (L1, L2, L3). 4-pole relays include a neutral pole (N) for switched neutral applications in four-wire systems. The neutral pole typically has the same current rating as the phase poles.
Can these relays be used for motor starting applications?
Yes. These relays are suitable for three phase motor starting and stopping applications, including direct-on-line (DOL) starting and reversing applications. Contact materials are selected for inductive load switching.
What is the maximum switching frequency?
Maximum switching frequency is typically 100 operations per hour at rated load. For higher frequency requirements, derating may be required to maintain electrical life.
Is simultaneous pole operation guaranteed?
Yes. The relay incorporates a mechanical interlocking mechanism that ensures all poles switch simultaneously, preventing phase imbalance conditions that could damage motors and equipment.
Material Selection Guide
- Contact Material — Silver Tin Oxide (AgSnO2): Provides resistance to contact welding and arc erosion for three-phase AC switching applications.
- Interlocking Mechanism — Stainless Steel: Provides mechanical coupling between poles with high tensile strength and wear resistance.
- Housing — UL94 V-0 Flame-retardant Thermoplastics: Provides dielectric strength and mechanical protection for industrial panel mounting.
- Terminals — Brass with Silver Plating: Minimizes contact resistance and provides corrosion resistance for power connections.
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Established in May 2021
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Annual exports account for about 30%
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The company occupies an area of 8,000 square meters.
Huajin Technology Jiaxing Co., Ltd. was established in May 2021 and is located at 707 Yanyu Road, Yucheng Town, Haiyan County, Jiaxing City, Zhejiang Province. It is a high-tech enterprise specializing in the research and development, production, and sales of relays.The registered capital of the company is 10 million yuan, covering an area of 8000 square meters, with more than 120 employees. The annual production capacity of magnetic latching relays is over 10 million, of which exports account for about 30%. The company has obtained ISO9001-2015 quality management system certification, and its relays have passed CCC certification, State Grid certification, TUV certification, etc. It also holds multiple technical patents. Our main products include motor relays, single-phase, two-phase, and three-phase magnetic latching relays, which have a wide variety of types and can meet various customized solutions for customers.
