3VA9877-0LB10 - Handle Blocking Device - 3VA 1200-2000A

3VA9877-0LB10 -  Handle Blocking Device -  3VA 1200-2000A

Sometimes it’s the small components that solve the biggest headaches. The Siemens 3VA9877-0LB10 blocking device is one of those parts—simple, but essential when you need to keep a circuit breaker exactly where it should be.

Made for SENTRON 3VA series 3-pole circuit breakers, this accessory lets you physically block the toggle handle to prevent it from being switched on or off unintentionally. That’s especially useful during maintenance or service work, where the last thing you want is someone restoring power too soon. It gives you a straightforward way to add control and avoid unnecessary risk.

There’s nothing complicated about it. It installs easily, fits the breaker the way it should, and does its job without getting in the way. If you’re working in an environment where safety procedures matter—and they always should—this is a practical add-on that earns its place quickly.

Key Features and Benefits

• Stops Unwanted Switching – Keeps the breaker handle from being moved when it shouldn’t be
• Helps with Lockout/Tagout – Adds an extra layer of safety during maintenance work
• Built for Siemens 3VA Breakers – Designed to match 3-pole SENTRON 3VA models
• Simple to Install – No complicated setup or special tools required
• Adds Peace of Mind – Reduces the chance of accidental energizing
• Dependable Build Quality – Designed to hold up in real-world electrical environments

Technical Specifications

• Manufacturer: Siemens
  
• Series: SENTRON 3VA
  
• Catalog Number: 3VA9877-0LB10
  
• Product Type: Toggle Handle Blocking Device
  
• Compatible Models: 3VA57 / 3VA58 / 3VA59
  3VA67 / 3VA68 / 3VA69 (3-pole)
  
• Weight: 0.2 kg (200 g)
  
• Dimensions: 172 x 333 x 52 mm
  
• Country of Origin: Mexico
  
• Product Status: Active
  

Material Compliance and Certifications

• RoHS Compliant – Meets current environmental standards
• REACH Compliant – In line with material safety regulations
• Export Classification: EAR99
• Non-Hazardous – Safe for standard industrial use

Where It Works Best

• Maintenance and service work
• Industrial equipment and production lines
• Commercial electrical panels
• Facilities following strict lockout/tagout procedures
• Utility and infrastructure projects