Singapore, 01/07/2026 – Mun Hean announces that one of its flagship products, the MH Protection Relay, was granted its first patent in the design of its proprietary MTB (Mechanical Trip Button).
The MH electrical protection relay has developed over several generations into an advanced solution engineered to enhance the stability, precision and reliability of modern electrical protection systems.
Developed in response to increasingly complex operating environments, the patented design addresses key limitations in conventional protection relays, where sensitivity to transient conditions can result in unnecessary tripping and system disruption. Mun Hean’s approach introduces a more controlled and refined trip mechanism, supporting consistent system performance under dynamic load and network conditions.
“Electrical protection today requires more than responsiveness — it requires precision,” said Er Voon Yip Seng, Senior Manager of Mun Hean Singapore. “The MH Protection Relay with MTB reflects our focus on engineering solutions that respond intelligently to real-world operating conditions, enabling greater system stability and operational confidence.”
By rethinking traditional trip response design, the integration of a mechanical trip button enables improved control over protection behaviour while maintaining the integrity of system safety. This results in enhanced operational continuity, particularly in environments where reliability is critical and interruptions carry significant consequences.
The solution is well-suited for applications across industrial operations, energy systems and critical infrastructure. Its relevance is especially pronounced in high-performance environments such as Battery Energy Storage Systems (BESS), where precise protection and system stability are essential.
This milestone reinforces Mun Hean’s commitment to advancing engineering excellence through purposeful innovation. The company continues to invest in the development of solutions that address evolving demands in power quality, system performance and protection design.
Further technical insights and application perspectives will be shared through upcoming industry engagements and digital platforms.
MH Protection Relays Certified with (CE) Mark
Singapore – MH Protection Relay has been certified by the national certification body, TUV SUD PSB, to have fulfilled all requirement for performance and safety standards in accordance with Conformitè Europëenne (CE) Mark.
By affixing the (CE) Mark, the MH Protection Relays are ready for export for use in Europe. At the same time, the (CE) Mark attests to the high safety, environmentally friendly and performance standards of the Protection Relays that are well-known in the Asian market.
The TUV SUD PSB is the same independent lab that certified the MH Protection Relay in accordance with IEC 60255 Standard. Type tests certified by TUV SUD PSB include electromagnetic compatibility (EMC) tests, environmental tests, mechanical tests and product safety tests.
The EMC test affirms the MH Protection Relays’ robustness against external EMC interference as well as verifying that the device is not a source of EMC disturbance. The environmental tests assess MH Protection Relays’ performance under cyclic temperature, humidity and durability under elevated environmental stress. At the same time, mechanical tests include vibration, shock and bump tests. These tests simulate conditions such as mishandling and stress during transportation.
The full range of MH Protection Relay is certified under the (CE) Mark as well as IEC 60255 standard by TUV SUD PSB. The product models are as follows:
- Combined Overcurrent & Earth Fault Relay, REA200n and REA200e
- IDMTL Overcurrent Relay, ROA207n and ROA207e
- IDMTL Earth Fault Relay, REF052n and REF052e
- DTL Overcurrent Relay, OA703 and OA703e
- DTL Earth Fault Relay, EF18, EF18e, REF18e
- Earth Leakage Relay, EL series, EL P series, REL series, EL D series