3VA5270-5EF31-0AA0 - MFAS 70 Amp Circuit Breaker

3VA5270-5EF31-0AA0 - MFAS 70 Amp Circuit Breaker

If you’ve ever dealt with nuisance trips or breakers that don’t respond the way they should, you already know why consistency matters. The Siemens 3VA5270-5EF31-0AA0 is built for exactly that—steady, predictable protection without the need to constantly tweak or second-guess your setup. This is a 70 amp, 3-pole breaker from the 3VA5 series, designed for line protection in commercial and industrial environments. It uses a thermal magnetic trip unit, which means it handles both overloads and short circuits in a straightforward, time-tested way. The overload protection is fixed at 70 amps, and the instantaneous trip is set at 10 times that—so when a fault hits, it reacts fast and gets things under control. With a 35kA interrupting rating at 480V, it’s more than capable of handling higher fault levels found in many modern systems. And because it’s part of the 3VA52 frame family, you’re getting a compact design that doesn’t eat up unnecessary space inside your panel. Bottom line—this is the kind of breaker you install and don’t have to think about again. It just does its job.

Key Features and Benefits

• 70 amp rating: for dependable circuit protection
• 3-pole design: for three-phase systems
• 35kA interrupting capacity: at 480V
• Thermal magnetic trip unit (TM240): for combined protection
• Fixed trip settings: no adjustments needed
• Instantaneous trip: at 10× rated current
• Compact 3VA52 frame: helps save panel space

Technical Specifications

• Part Number: 3VA5270-5EF31-0AA0
• Series: 3VA5
• Type: 3VA52
• Poles: 3
• Amperage: 70A
• Interrupting Rating: 35kA @ 480V
• Trip Unit: TM240 (Thermal Magnetic)
• Overload Protection (Ir): 70A (fixed)
• Short-Circuit Protection (Ii): 10 × In
• Frame Size: 250
• Dimensions: 9.65" H × 6.3" W × 5.9" D

Material Compliance and Certifications

• UL Listed: for use in North American electrical systems
• Manufactured: to Siemens quality standards
• Suitable: for installations requiring NEC compliance

Where It Works Best

• You’ll typically see this breaker used in commercial buildings, industrial panels, and equipment setups where reliability matters more than adjustability. It’s a good fit for distribution panels, motor loads, and machinery that need straightforward, no-fuss protection.