A trusted manufacturing partner supplying precision current-collector and contact assemblies to transformer and electrical equipment makers across India — for over 40 years.
Every assembly is built from proven components and hand-finished by skilled craftsmen, then plated and quality-checked before dispatch.
A twin-roller carbon current-collector mounted in a formed steel bracket with a calibrated compression spring and copper braid lead. Engineered for reliable, low-resistance contact and long service life in transformer tap-changers and electrical switching gear.
A precision contact assembly — carbon brush and copper contact housed in a moulded body, terminated with a flexible copper braid and ring lug. Supplied with a matched compression spring for consistent contact pressure across the operating range.
Based in Kolkata, Bonik International has manufactured Carbon Roller and Tag-and-Tail assemblies for over 40 years. What began as a specialist workshop has grown into a dependable supplier trusted by transformer and electrical equipment manufacturers across India.
Our strength has always been consistency — steady pricing, reliable lead times, and components that perform exactly as specified, order after order.
Effective 1st October 2026, the Carbon Roller & Assembly business of Bonik International, Kolkata has been acquired by Dispotronics, India.
Orders will continue as normal, without interruption. Existing and new customers will receive the same products and service they have relied on for over 40 years.
For any further orders and enquiries, please forward them to:
All orders and enquiries are now handled by Dispotronics, India. Reach us using the details below.
Kolkata, West Bengal
& Pune, Maharashtra