Square D | Q1B3701021 | Circuit Breaker | 70A | 3-Pole | 240V | Bolt-On

Designed for demanding electrical installations, the Square D Q1B3701021 70A, 3-Pole, 240V Bolt-On Circuit Breaker is built for reliable protection in panels that accept bolt-on style devices. Whether you're performing a maintenance swap, a retrofit, or a replacement, this breaker keeps your 3-phase or 240V circuits safely controlled with precise trip performance.

Key specifications

• Amperage: 70 A
• Poles: 3-Pole
• Voltage: 240 V
• Mounting: Bolt-On
• Part number: Q1B3701021
• Typical use: maintenance, retrofit, replacement in compatible Square D panels

Why this bolt-on breaker stands out

• Secure bolt-on mounting provides a solid, vibration-resistant connection that stays engaged in demanding panel environments.
• Precisely matched to Square D panels that accept bolt-on 3-pole 70 A devices, ensuring dependable tripping characteristics and consistent electrical protection.
• Clear compatibility reference: the part number Q1B3701021 is the most reliable way to verify fit before purchase.

Practical use cases

• Upgrading service or motor circuits in commercial or industrial panels that run on 240V with 3-phase loads.
• Replacing a failed or obsolete breaker in panels that specify bolt-on 3-pole 70 A devices.
• Retrofits where a similar amperage and mounting style is required to maintain panel catalog consistency.

Installation notes

• Before ordering, confirm that your panel model accepts bolt-on, 3-pole 70 A, 240V devices and that the Q1B3701021 matches the panel’s catalog listing.
• Have a qualified electrician perform installation, ensuring the power is off and the panel is de-energized during replacement.
• Follow all applicable electrical codes and the panel manufacturer’s instructions for mounting torque and wiring.