SQUARE D
SQUARE D HDL36125 Molded Case Circuit Breaker, POWERPACT H Series, 125A, 3 Pole
A 125 A three-pole molded-case breaker rated 600 V AC and 250 V DC with a 25 kA interrupting capacity at 240 V AC, thermal-magnetic trip set at 900 A low and 700 A high.
- 125 A continuous current rating protects heavy-duty circuits
- 25 kA interrupting capacity at 240 V AC handles large fault currents
- Thermal-magnetic trip unit provides reliable overload and short-circuit protection
- Three-pole design suits three-phase power distribution systems
- Compact 6.4 × 4.12 × 4.36 in frame fits standard panel layouts
Industrial three-pole protection
The SQUARE D HDL36125 is a molded-case circuit breaker from the POWERPACT H series rated at 125 A with a 600 V AC and 250 V DC voltage rating. It uses thermal-magnetic trip units with fixed instantaneous settings and a 150 A frame size for standard three-phase distribution panels.
Suited for panel builders needing 25 kA
Installers who require adjustable instantaneous trip or electronic trip units should look elsewhere. The fixed instantaneous setting and standard breaker type limit flexibility for selective coordination schemes that demand programmable curves.
Lug terminals simplify wiring
Line and load lug connections accept cable directly without separate terminal kits, reducing installation time. The fixed high and low amp trip settings of 700 A and 900 A mean no field calibration is required, but they also prevent fine-tuning for specific load profiles.
Highlights
- 125 A continuous current rating protects heavy-duty circuits
- 25 kA interrupting capacity at 240 V AC handles large fault currents
- Thermal-magnetic trip unit provides reliable overload and short-circuit protection
- Three-pole design suits three-phase power distribution systems
- Compact 6.4 × 4.12 × 4.36 in frame fits standard panel layouts
Specifications
| Brand | SQUARE D |
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Questions about this item
What panelboard or enclosure rated for a 150 A frame accepts this 125 A three-pole breaker?
Any panelboard or enclosure listed for a 150 A HD frame with three-phase ABC buswork and lugs that accept the line/load terminals will accept this breaker.
Will this 25 kAIC breaker coordinate with an existing 250 V DC branch circuit?
Yes, the breaker carries a 250 V DC rating, so it can protect a DC branch circuit within its voltage and interrupting limits.
How can I verify the thermal-magnetic trip operates at the 700 A high and 900 A low settings after installation?
Apply a calibrated primary-injection test set at the 700 A and 900 A levels; the breaker should trip within the thermal-magnetic time-current curve for each setting.
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