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Carbon Brush Holders

Slip ring brush holder GA4124

Part No. GA4124

GA4124 Slip ring brush holder is a heavy-duty BGB grounding brush holder rated at 120A, specially built for wind turbine generator shaft lightning protection and shaft voltage dissipation. Made of cast brass housing with stainless steel constant force spring, it creates a low-resistance rotating earthing path. It protects generator main bearings from electrical damage caused by shaft voltage and lightning surges. Optional arc spreader bracket available for overload backup protection. Commonly us

Material	High strength copper alloy / brass casting, low impedance for lightning surge dissipation
Dimensions	- Rated current: 120A - Single brush cavity design - Pre-drilled mounting holes for bolt-on installa
Application	BGB GA4124 slip ring / grounding brush holder, designed for wind turbine generator shaft grounding and lightning surge protection. It provides low-impedance earthing path to divert lightning and shaft voltage, protecting main generator bearings against el
Voltage	Suitable for transient high surge voltage for lightning protection, continuous l
Current Density	Specified for 120A peak surge current, stable continuous low grounding current
Hardness	Brass housing: High mechanical hardness, vibration resistant, corrosion resistan
Grade	OEM equivalent replacement grade for BGB GA4124 shaft grounding brush holder

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Technical Specifications

Model Number	GA4124
Product Type	Slip Ring / Shaft Grounding Brush Holder
Brand	BGB
Rated Peak Current	120 Amp
Housing Material	Cast Brass / Copper Alloy
Spring Type	Stainless Steel Constant Force Spring
Brush Quantity	1 Carbon Brush
Mounting Method	Bolt-on Mounting
Core Function	Shaft voltage dissipation, lightning surge protection, bearing protection
Optional Component	Arc diversion bracket for overload backup protection
Application	Wind turbine generator shaft grounding system
Working Location	Onshore & Offshore Wind Turbine Nacelle
Usage	Wind farm generator maintenance OEM replacement spare part

Description

GA4124 slip ring brush holder is a robust 120A grounding brush holder assembly developed for wind turbine shaft earthing and lightning surge protection. The housing is manufactured from cast brass copper alloy, delivering ultra-low impedance to conduct transient lightning energy safely to ground. Equipped with high-performance stainless steel constant force spring, it keeps steady contact pressure between carbon brush and rotating generator shaft, ensuring reliable continuous earthing under long-term vibration in wind turbine nacelles. Optional arc propagation bracket can be fitted as backup protection for overload surge conditions. This brush holder diverts harmful shaft voltage and lightning surge away from generator bearings, preventing bearing electrical erosion and extending generator service life. Bolt-on mounting enables quick field replacement to cut wind turbine downtime. It is a critical spare part for onshore and offshore wind turbine generator maintenance, matching original GA4124 dimensional and performance specifications.