SIEMENS 8UC7222-3BB20 Cabinet Door Operating Handle

Overview

Core Appearance Markers

• Handle body: Red (emergency OFF identification)
• Surrounding masking frame: Yellow safety warning background
• Equipped with standard metal square drive connecting shaft
• Built-in door interlock & padlock locking function

Key Specifications

1. Compatibility

• Matched disconnect switches: 3KL52, 3KM52, 3KL53, 3KM53, 3kA series load break disconnectors
• Drive shaft specification: 8 mm × 8 mm square output shaft
• Size grade: Size 2 standard handle frame

2. Safety & Mechanical Features

• Door interlock function: Cabinet door can only be opened when the switch is fully OFF; door locked when switch is ON to prevent live maintenance
• Lockable design: Can be secured with padlocks in OFF position for LOTO lockout-tagout safety procedures
• Handle color coding: Red rotary handle + yellow frame conforms to IEC safety standard for main power isolation devices
• No extendable shaft; standard matching connecting shaft included

3. Environmental & Certification

• Origin: Germany
• Operating temperature: -20 ℃ ~ +60 ℃
• Certifications: CE, UL, CSA, RoHS compliant
• Weight: ~0.403 kg
• Protection grade: Front panel IP65; rear shaft part IP20 (cabinet interior)

Main Functions

1. External cabinet door operation of internal disconnect switch
    
   Installed on cabinet front panel, operator can turn the red rotary handle to switch the main power disconnector ON/OFF without opening the live cabinet door, improving operation safety.
2. Mechanical door interlock safety protection
    
   When the disconnect switch is closed (power ON), the cabinet door is mechanically locked and cannot be opened; only after switching to OFF state can the door be unlocked, avoiding accidental contact with live components.
3. LOTO lockout safety management
    
   Multiple padlocks can be mounted on the handle in OFF position to lock power off during equipment maintenance, complying with industrial machine safety lockout regulations.
4. Visual safety identification
    
   Red handle + yellow high-visibility frame clearly marks the main power isolation point for quick recognition by operators.

Advantages

• Integrated door interlock eliminates the risk of opening cabinet doors under live power
• Standard 8×8mm square drive shaft, universal matching all Size 2 3KL/3KM disconnect switches
• Padlockable design fully meets factory maintenance LOTO safety requirements
• High-visibility red-yellow safety color scheme, consistent with global low-voltage safety standards
• Robust plastic housing resistant to workshop oil mist, dust and vibration
• Complete assembly (handle + yellow frame + drive shaft), ready for direct installation without extra accessories