3VA9578-0LB10 - Padlockable Device - 800-1000A
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3VA9578-0LB10 - Padlockable Device - 800-1000A Description
3VA9578-0LB10 - Padlockable Device - 800-1000A
Sometimes the smallest components are the ones that prevent the biggest problems. The Siemens 3VA9578-0LB10 handle blocking device is a simple add-on, but it plays an important role—keeping your circuit breaker handle fixed in place so it can’t be moved unintentionally.
Built for Siemens SENTRON 3VA5 series breakers (including 3VA55, 3VA65, and 3VA66), this accessory gives you a reliable way to secure the breaker during maintenance or when you need to restrict access. If you’ve ever dealt with unexpected breaker operation—or just want tighter control over your system—this is the kind of part that helps eliminate that risk.
It’s straightforward in design and easy to integrate, which is exactly what most electricians and facility teams are looking for. No unnecessary complexity—just a practical solution that does what it’s supposed to do, every time.
Key Features and Benefits
- Helps prevent accidental or unauthorized breaker operation
- Supports lockout/tagout (LOTO) safety procedures
- Designed specifically for Siemens 3VA55, 3VA65, and 3VA66 breakers
- Adds an extra layer of control during maintenance and service work
- Simple installation with a secure, consistent fit
- Built to handle everyday industrial and commercial use
Technical Specifications
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Manufacturer: Siemens
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Product Line: SENTRON
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Catalog Number: 3VA9578-0LB10
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Type: Handle Blocking Device / Locking Provision
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Compatible Models: 3VA55, 3VA65, 3VA66
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Weight: 0.525 kg (525 g)
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Dimensions (L x W x H): 298 x 179 x 84 mm
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Country of Origin: Mexico
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Lifecycle Status: Active
Material Compliance and Certifications
- Complies with RoHS substance restrictions
- Meets REACH requirements
- Non-hazardous for standard handling and transport
- Export classification: EAR99
Where It Works Best
- Industrial facilities with routine maintenance schedules
- Commercial buildings with shared electrical panels
- Equipment rooms where multiple technicians are working
- Data centers or critical systems where stability matters
- New panel builds that include safety-focused components
Use of Original Equipment Manufacturer (OEM) trademarks, names, and logos is for informational and identification purposes only. This does not imply any affiliation, sponsorship, endorsement, or approval by the original equipment manufacturer. CIRCUIT BREAKER SUPERSTORE® is an independent reseller and is not an authorized distributor, affiliate, or representative of any manufacturer. Manufacturer warranties do not apply unless expressly stated. All trademarks and registered trademarks are the property of their respective owners.
Siemens®, I-T-E®, and Murray® are registered trademarks of Siemens AG. Products sold are surplus, used, or refurbished and are NOT supplied by Siemens AG or its affiliates.
Specifications
- Depth:0.5
- Height:4.0
- Width:4.0
- Sub-Category:LOCK-OFF
Returns are easy
You may return unused items within 30 days of delivery for a full refund.
FREE shipping on breaker orders over $100 and all other items with orders over $500.
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Same Day Shipping
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In rare circumstances, CIRCUIT BREAKER SUPERSTORE® may reserve up to 5 business days to complete shipment. Feel free to contact us if your order is time sensitive.
CIRCUIT BREAKER SUPERSTORE® provides a limited 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer).