In late March 2026, a delegation from KIMBAL, a well-known Indian electricity meter company, visited Xiamen for a two-day in-depth exchange on intelligent manufacturing and precision metal forming technologies for core components of magnetic latching relays. This visit focused on automated assembly and high-precision stamping and welding processes for power relays, signifying a further clarification of the two parties' cooperation intentions in the fields of smart grids and new energy power monitoring.
On March 26th, the Indian delegation visited the Xiamen APOLLO Automation Equipment Factory and first inspected the overall technical solution of the automated assembly line for magnetic latching relays. This production line is specifically designed for the efficient and consistent manufacturing of Manganin Shunt latching relays, integrating key modules such as material feeding, visual alignment, micro-resistance detection, laser or electron beam connection, and automatic sorting. Technical personnel highlighted the entire process control logic of the Shunt Terminal, from material composite to functional integration, emphasizing the synergistic optimization of manganese-copper alloy and high-purity copper in terms of heat treatment, aging stability, and low thermoelectric potential. The Indian experts highly recognized the production line's capabilities in ±5% resistance tolerance control, process data traceability, and long-term operational stability, noting, "Your systematic engineering capabilities in the field of relay automation equipment fully demonstrate industry-leading professional standards."
On March 27th, the delegation moved to Xiamen Apollo Stamping Welding Technology Co., LTD to conduct in-depth research on the production process system for stamped sheet metal. The demonstration showcased the complete chain from raw material cutting and multi-station forming to post-processing. For precision stamping parts, the factory uses customized metal stamping dies in conjunction with a servo press to achieve one-time forming of complex geometries, with tolerance control down to ±0.05 mm. Simultaneously, the progressive die stamping process significantly improves the production efficiency and material utilization of custom metal stampings.
During the welding process, the Indian meter manufacturer KIMBAL gained a detailed understanding of the connection solutions for highly conductive materials and functional alloys. For stamping parts that require a balance between electrical performance and mechanical strength, the factory employs vacuum electron beam welding or laser welding technology to ensure a metallurgical bond between the manganese copper and pure copper interfaces, avoiding impurities or voids that may be introduced by traditional brazing. This process is particularly suitable for current sampling scenarios with stringent long-term stability requirements, such as precision stamping parts in smart meters, energy storage BMS, and photovoltaic inverters.
The Indian representatives showed particular interest in the application potential of deep-drawn metal stamping in novel relay housings or shielding structures and expressed a strong willingness to conduct joint development in the new energy field in the future. They pointed out that with the upgrading of global energy efficiency standards, higher requirements are placed on the integration, lightweighting, and high-frequency performance of metal parts stamping, and China's accumulated experience in materials-process-equipment integration provides reliable support for their next-generation product platform.
This technical dialogue not only verified the feasibility of manufacturing high-precision manganese-copper shunts but also highlighted the importance of integrating intelligent manufacturing with materials science. As smart meters evolve towards Class 0.5S and even higher precision, the Matching Relay Manganin Shunt, as a core sensing element, directly determines the overall metering reliability. By integrating terminals, leads, and resistor functional areas through custom metal stampings, contact resistance fluctuations caused by secondary assembly are eliminated, and vibration resistance and weather resistance are significantly improved, meeting the requirements of international standards such as IEC 62053 for a service life of over 10 years.
The Indian representative expressed appreciation for the factory's flexible manufacturing strategy. Facing the demand for small-batch, multi-variety customization, the rapid mold change system and modular production line design can effectively shorten the new product introduction cycle, providing agile responses for new product development for global customers. This manufacturing philosophy of "process first, equipment support, and data closed loop" is precisely the core capability urgently needed by the current high-end power electronics supply chain.
This visit not only deepened mutual trust between the two sides in the field of core components for smart meters but also laid the foundation for expanding into new energy application scenarios. The Indian representative summarized, "What we saw was not just equipment, but a complete engineering implementation capability. This systematic thinking, from materials and processes to automation, is precisely the quality we are looking for in a long-term partner."
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