| |
Thanks to their patented overmolding technology and integrated thermal disconnecting system, these SPCs provide robust protection up to 50 kA while minimizing size (38.0 x 15.2 x 40.9 mm; L x W x H). Consequently, the MT40 series is commonly used in inverters, industrial power supplies, outdoor lighting, telecommunications systems, and surge protection devices (SPDs).
Designed for extreme electrical conditions, the MT40 series has a peak surge current capability of up to 50 kA (8/20 μs pulse) and a short-circuit current rating of up to 200 kA. The series is recognized as a UL 1449 Type 1CA component assembly, designed for use in applications with AC voltages ranging from 150 V to 550 V and DC voltages spanning from 200 V to 750 V. Additional features, such as a galvanically insulated normally open micro-switch for remote monitoring and an optional visual indicator, enhance system integration and operational safety. These MT40 components operate in temperatures ranging from -40 °C to +85 °C.
Supporting sustainable design practices and aligning with TDK’s commitment to environmental responsibility, the MT40 series is encapsulated in a flame-retardant epoxy coating. Its RoHS compliance and lead-free materials underscore its eco-conscious profile while ensuring high reliability under demanding conditions. By combining innovation, safety, and sustainability, MT40 ThermoFuse varistors offer system designers a compact, future-proof solution for next-generation industrial and communication systems.
Features & Applications
Main applications
• PV systems;
• Industrial power supplies;
• Outdoor lighting systems;
• Telecommunication systems;
• Surge protective device (SPD).
Main features and benefits
• Strap-terminated varistor with a thermal disconnecting system;
• Compact size;
• Flame-retardant epoxy encapsulation;
• Short circuit current rating (SCCR) up to 200 kA acc. to UL 1449;
• High peak surge current up to 50 kA;
• UL 1449-recognized as a type 1CA for both AC and DC applications (file number E321126);
• Normally open micro-switch for remote indication/monitoring circuit;
• Same electrode footprint of PCB for all types;
• RoHS, REACH, and PFAS compliant.
About TDK Corporation
TDK Corporation (tdk.com) is a global technology company and innovation leader in the electronics industry, based in Tokyo, Japan. With the tagline “In Everything, Better” TDK aims to realize a better future across all aspects of life, industry, and society. For over 90 years, TDK has shaped the world from within; from the pioneering ferrite cores to cassette tapes that defined an era, to powering the digital age with advanced components, sensors, and batteries, leading the way towards a more sustainable future. United by TDK Venture Spirit, a start-up mentality built on visions, courage and mutual trust, TDK’s passionate team members around the globe pursue better for ourselves, customers, partners, and the world. Today, the state-of-the-art technologies of TDK are in everything, from industrial applications, energy systems, electric vehicles, to smartphones and gaming, at the core of modern life. TDK’s comprehensive, innovative-driven portfolio includes cutting-edge passive components, sensors and sensor systems, power supplies, lithium-ion and solid-state batteries, magnetic heads, AI and enterprise software solutions, and more featuring numerous market-leading products. These are marketed under the product brands TDK, EPCOS, InvenSense, Micronas, Tronics, TDK-Lambda, TDK SensEI, and ATL. Positioning the AI ecosystem as a key strategic area, TDK leverages its global network across the automotive, information and communication technology, and industrial equipment sectors to expand its business in a wide range of fields. In fiscal 2025, TDK posted total sales of USD 14.4 billion and employed about 105,000 people worldwide.
|
debbie.martin[.]tdk.com 
