Plunger-type limit switch widely adopted in railway circuit breakers due to high reliability.
Plunger Limit Switch PPMU・PSPD Series
It is used in the auxiliary contacts of circuit breakers for railway vehicles, including the Shinkansen, which require high reliability, and has contributed to the safe operation of railways for many years!
The circuit breaker device is installed in the control box under the vehicle floor. The vacuum contactor of the main conversion device for motor control using VVVF inverters opens and closes every time it passes between substations. Our plunger-type magnetic proximity switch is used as an auxiliary contact for the vacuum contactor. The contact part uses the glass-sealed contact "Bestact," which has no oxidation or corrosion, ensuring outstanding reliability. Bestact features our unique structure, different from conventional reed switches, achieving a long-lasting product with excellent environmental and vibration resistance.
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basic information
Plunger-type Magnetic Proximity Switch PPMU・PSPD Series ■ Rated Operating Current 〇 Medium Capacity Type AC220V 0.5A (50/60Hz) DC110V 0.3A (L/R=40ms) 〇 Large Capacity Type AC220V 1A (50/60Hz) DC220V 0.2A (L/R=100ms) DC110V 0.5A (L/R=100ms) ■ Minimum Operating Voltage and Current (Large Capacity Type and Medium Capacity Type) 24V 1mA* 5V 10mA* Failure Rate λ₆₀ = 4.6×10⁻⁹ (/ time) or less * For digital applications with phototransistor lighting circuits ・PPMU-E (Large Capacity) Contact Configuration: 1db + Bestact Contacts (5 contacts in total, a contacts and b contacts combined) ・PSPD-07G (Medium Capacity) Contact Configuration: 2a contacts, 1a1b contacts, 2b contacts For product details, please download the "Relay/Proximity Switch/Limit Switch Specification Catalog" from our website and refer to the product page. Download URL: https://www.bestact.co.jp/gl/download/catalog/general
Price information
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Applications/Examples of results
Application: Circuit breakers in the railway sector Adopted products: Plunger-type magnetic proximity switches PPMU and PSPD series
Detailed information
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This product is equipped with Yaskawa Power Lead Switch Bestact. Our products have been recognized for their value by customers over many years in markets that demand high reliability and safety. We have prepared materials to explain "Bestact," the core technology that makes our products long-lasting and highly reliable, so please take a look at the catalog "[Material] What is a Lead Switch?"
Company information
For over 40 years, our relays and sensors have been used in various markets where reliability and safety are required, such as in Shinkansen (bullet trains) and steel manufacturing. With advantages such as an electrical lifespan that is twice that of general relays and a failure rate that is 1/20 under minimal loads, our products contribute to improving equipment reliability while also reducing running costs by decreasing the frequency of replacements. Leveraging the excellent environmental resistance of our products, they perform well even in harsh environments, such as in vegetable factories where humidity is present.
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