Surge arresters are critical protection devices used in power transmission and distribution systems. To ensure safe and stable operation, they are always installed with disconnectors and mounting brackets, which serve important mechanical and protection roles.
This article explains the function of thermal disconnectors (isolators) and insulating mounting brackets used in lightning arrester systems.
What is a Surge Arrester Disconnector?
A surge arrester disconnector (also called a thermal isolator or hydrostatic release unit) is a safety device installed in series with the arrester ground lead.
Function:
- Automatically disconnects the arrester from the system during failure
- Prevents system grounding fault from spreading
- Keeps the distribution line operational
Working Principle:
When internal arrester failure occurs:
- Excess current generates heat and pressure
- Thermal element activates
- Ground connection is safely disconnected
👉 This prevents permanent system outage.
What is a Mounting Bracket?
A mounting bracket is a structural support component used to fix surge arresters on poles, transformers, or switchgear.
Function:
- Secure mechanical installation of arrester
- Maintain electrical clearance distance
- Ensure long-term stability under vibration and wind load
Materials Used in Our Brackets
We manufacture high-strength insulating brackets using:
- SMC composite material
- Fiberglass reinforced polymer (FRP / CMS)
Advantages:
- High mechanical strength
- Excellent insulation performance
- UV and weather resistance
- Long service life in outdoor environments
Why Quality Matters
Low-quality brackets and disconnectors may cause:
- Mechanical failure under wind load
- Poor insulation performance
- Arrester misalignment
- System safety risks
Our products use 100% new raw materials, ensuring stable mechanical and electrical performance.
Applications
- Power transmission lines
- Distribution pole-mounted arresters
- Substation surge protection systems
- Railway electrification systems
- Industrial power networks
OEM and Customization
We provide full OEM services:
- Custom bracket design
- Mold development for special installation requirements
- Logo printing on products and packaging
- Engineering support for arrester integration
Types and Apperance of Bracket:
Types of Disconnectors:
