Digital guide
You are here:
GE TKMA836700
Product Name: GE TKMA836700 700A 600V 3-Pole Thermal-Magnetic Molded Case Circuit Breaker (TKM8 Frame)
Product Introduction: The TKMA836700 is a high-capacity molded case circuit breaker from GE’s Spectra / TKMA series, utilizing an 800 A (TKM8) frame with a 700 A continuous current rating. It features an interchangeable thermal-magnetic trip unit and is designed for large industrial and commercial distribution feeders, large motor mains, and transformer secondary protection.
Detailed content
Technical Specifications:
- Rated Current: 700 A
- Frame Size: TKM8 (800 A frame)
- Rated Voltage: 600 V AC max (Ui 750 V AC)
- Poles: 3
- Trip Unit: Interchangeable thermal-magnetic
- Interrupting Capacity (AIC): 22 kA @ 600 V AC, 30 kA @ 480 V AC, 42 kA @ 240 V AC (Older Style: 25 kA @ 600 V, 35 kA @ 480 V, 65 kA @ 240 V in alternate rating)
- Short-Circuit Instantaneous: Electromagnetic coil, typical 8–12 × In
- Mechanical Life: ≥ 10,000 operations
- Electrical Life: ≥ 5,000 operations at rated current
- Dimensions: 15.5 in (H) × 8.25 in (W) × 5.5 in (D)
- Weight: ≈ 55 lb
- Connection: Includes load-side lugs; bolt-on design; internal common trip mechanism ensures all poles trip simultaneously
- Certification: HACR Rated (heating, air conditioning, refrigeration)
Functional Features: Interchangeable trip unit allows field replacement and re-rating; internal common trip mechanism for simultaneous pole interruption; HACR rating for HVAC applications; bolt-on design for secure, simplified installation; thermal-magnetic protection combining overload and short-circuit sensing.
Material & Structure: Glass-fiber reinforced thermoset molded case (high-temperature resistant, flame-retardant); copper alloy main contacts with silver-alloy contact inserts; laminated steel arc chute; tin-plated copper bolt terminals; dual-hole lug terminals support large-section copper bus or cables.
Working Principle: During an overload, the bimetallic strip heats and bends inversely with time (adjustable trip versions allow 0.7–1.0 × In adjustment), tripping the mechanism. During a short circuit, the electromagnetic coil generates a high instantaneous force (8–12 × In) that rapidly releases the latch, opening all poles simultaneously via the internal common trip mechanism.
Application Scenarios: Large industrial distribution feeders, large motor main circuits, transformer low-voltage secondary protection, commercial building service entrances, HVAC and refrigeration systems (HACR rated).
Installation Requirements: Mount vertically on a switchboard frame or dedicated breaker bracket; tighten terminal lugs to specified torque (typically 40–60 N·m) with antioxidant compound on aluminum connections; ensure proper bonding and grounding; allow clearance for heat dissipation; ambient temperature -10 °C to +50 °C (derate above 2000 m altitude).
Usage Precautions: Monitor connection point temperature rise via infrared (recommended ≤ 65 K rise) for 700 A operation; periodically verify and recalibrate adjustable trip settings; never forcibly re-close after a fault without clearing the root cause; inspect contacts for wear and mechanisms for lubrication periodically.
