SIEMENS 3VT1708-2DM36-0AA0 Molded Case Circuit Breaker (MCCB)

Overview

Key Specifications

1. Electrical Parameters

• Rated current In: 80 A
• Poles: 3P three-phase
• Rated operational voltage Ue: AC 415 V (50 Hz), max insulation voltage Ui 690 V
• Ultimate short-circuit breaking capacity Icu: 25 kA @ 415 V AC
• Trip unit: Adjustable thermal-magnetic LI trip for motor protection
  • Overload setting Ir: 64 ~ 80 A (continuous overload protection)
  • Short-circuit instantaneous setting Ii: 400 ~ 800 A (short-circuit fast cut-off)
• Connection type: Screw cable terminal (cage clamp for bare copper wires)
• Without built-in auxiliary contact / alarm switch / shunt trip coil (all accessories purchased separately)
• Mechanical endurance: 20,000 switching cycles

2. Mechanical & Environmental

• Mounting mode: Fixed installation
• Protection grade: IP20 (only for cabinet internal installation)
• Operating temperature: -20 ℃ ~ +50 ℃ (no current derating within 50℃)
• Dimensions (W×H×D): 76 mm × 130 mm × 70 mm
• Standard accessories expandable: Auxiliary switch, fault alarm contact, shunt release, undervoltage release
• Certifications: CE, IEC 60947-2, RoHS compliant

Main Functions

1. Motor overload long-delay protection
    
   Adjustable thermal trip curve matches motor starting and continuous operation characteristics; avoid motor winding burnout caused by long-term overloading.
2. Instant short-circuit protection
    
   Magnetic instantaneous trip quickly cuts off huge short-circuit current within milliseconds, prevent arc flash and cable burning accidents.
3. Three-phase circuit isolation
    
   Can act as main incoming isolation switch for motor control cabinets, completely disconnect power during equipment maintenance.
4. Fault visual indication
    
   Built-in trip indicator window, clearly distinguish manual switching-off and fault tripping status for rapid on-site troubleshooting.
5. Universal industrial power distribution protection
    
   Suitable for three-phase motor feeders, small distribution cabinet branch circuits, fan & pump load protection.

Advantages

• Dedicated motor protection trip curve, perfectly adapt to motor heavy starting current without false tripping
• Compact small frame size saves cabinet layout space compared with large frame MCCBs
• 25kA high breaking capacity meets most factory low-voltage distribution short-circuit requirements
• Adjustable thermal and magnetic thresholds, flexible matching different power motors
• Modular design, all auxiliary accessories can be installed on site without replacing the main breaker
• Wide operating temperature range, stable operation in workshop, water treatment, HVAC and other industrial environments
• Line-load reversible design, flexible wiring layout without polarity restriction