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AIRPAX / SENSATA M3901905251S Magnetic Circuit Breaker

The AIRPAX / SENSATA M39019/05-251S is a critical component for circuit protection in a wide range of applications, particularly within military and industrial settings. This low-power, sealed, trip-free three-pole magnetic circuit breaker is designed to interrupt circuit currents under fault conditions, preventing damage to equipment and ensuring safety. Its robust construction and sealed design make it suitable for use in harsh environments. The device features a trip-free mechanism, ensuring that the circuit is interrupted quickly and reliably. It is compliant with MIL-PRF-39019 standards, guaranteeing consistent performance and quality. The circuit breaker's compact size and reliable operation make it an ideal choice for applications where space is limited and dependable circuit protection is essential.

Authorized Distributors
Source:DigiKey
Part No:M39019/05-251S
Stock:0
Inv Date:06-09-2026
Price: Unit price: $2443.56
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Part No:M39019/05-251S
Stock:0
Inv Date:06-10-2026
Price: Unit price: $2443.55
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Part No:M39019/05-251S
Stock:0
Inv Date:06-09-2026
Price: Unit price: $3065.48
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Part No:M39019/05-251S
Stock:2
Inv Date:06-09-2026
Price: Unit price: $1870.05
Buy/RFQ:
Part No:M39019/05-251S
Stock:2
Inv Date:06-09-2026
Price: Unit price: $1870.05
Buy/RFQ:

AIRPAX / SENSATA M3901905251S Magnetic Circuit Breaker Specifications:

  • voltage_and_frequency_rating: 50 V dc, maximum and 240 V ac, maximum at 60 Hz and 400 Hz
  • high_inrush: 800 percent at 60 Hz and dc, 1,400 percent at 400 Hz
  • current_rating: See table I
  • time_delay: See table I
  • resistance_or_impedance: See table I
  • pin: The PIN shall be M39019/05-(dash number taken from table I)
  • weight: Approximately 150 grams
  • tolerance: ±.031 (0.79 mm)
  • hex_mounting_nut_thread: .375-32 UNEF-2B thread, .093 ±.005 (2.36 ±0.13 mm) thick or equivalent MS25082-20, -B20
  • internal_tooth_lockwasher_od: .507/.493 O.D., .392/.382 I.D., .025 ±.005 (0.64 ±0.13mm) thick, stainless steel or equivalent MS35333-134
  • effective_bushing_thread_length: .280 (7.11 mm) minimum
  • marking_location: May appear on any surface except the mounting surface
  • lock_ring_requirement: Not required if on-off plate has locking tab
  • numerical_marking: Optional on circuit diagram
  • sealscrew_thread: .138-32 UNC-2A x .312 (7.92 mm) long, stainless steel number 18-8 (type 347) MS35265-25 or equivalent
  • panel_screw_usage: Enhances circuit breaker shock and vibration characteristics
  • threaded_insert_height_exceedance: .005 to .015 (0.13 mm to 0.38 mm)

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Frequently Asked Questions

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How do I troubleshoot issues or seek technical support for part M3901905251S?

You can download the M3901905251S datasheet or visit the AIRPAX / SENSATA website for support.

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AIRPAX / SENSATA

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