Siemens Q320HH 20A 3-Pole 240 V Circuit Breaker Potential Transformer

Introducing the Siemens Q320HH 20A 3-Pole 240 V Circuit Breaker Potential Transformer — a purpose-built protection device engineered for reliable three-phase safeguarding in commercial and industrial electrical systems. This 20-amp, 3-pole breaker is designed to interrupt all three phases quickly and safely, helping protect equipment and wiring from overloads, short circuits, and fault conditions.

What it is and how it protects your system

The Q320HH is a three-pole circuit breaker rated for 240 V operation, delivering dependable protection for three-phase circuits. When abnormal current is detected, it trips to disconnect all phases, preventing damage to motors, pumps, HVAC equipment, and other heavy loads. The inclusion of “Potential Transformer” compatibility indicates its utility within protection schemes that rely on accurate voltage and current monitoring, enabling safer metering and relay coordination in complex distributions.

Key specifications

• Current rating: 20 A
• Poles: 3
• Voltage rating: 240 V
• Part Number: Q320HH
• Function: Three-pole circuit protection for 3-phase circuits

Benefits and practical use cases

• Ideal for protecting 3-phase motor circuits, pumps, fans, compressors, and larger lighting or distribution runs in commercial facilities.
• Ensures synchronized disconnection of all three phases, reducing the risk of unbalanced loads and equipment damage during faults.
• Designed to integrate with Siemens panels and protection schemes that incorporate potential transformer monitoring, supporting accurate fault detection and relay coordination.
• Simple replacement in compatible Siemens enclosures, making upgrades or panel refurbishments straightforward for electrical contractors and maintenance teams.
• Compact, reliable construction suited for installations where space is at a premium but dependable protection is non-negotiable.

Installation, compatibility, and best practices

Install the Q320HH in Siemens-compatible panels and distribution boards that accept this 3-pole design. Verify that the panel bus, mounting style, and accessory support align with the Q320HH specifications. Follow standard electrical safety practices, secure proper torque on mounting hardware, and adhere to applicable electrical codes. If your protection scheme uses metering or relays with potential transformers, this breaker is well-suited to integrate into that setup for coordinated protection and accurate monitoring.

Why choose this Siemens model

Compared with generic 3-pole breakers, the Siemens Q320HH offers precise compatibility with Siemens electrical ecosystems, streamlined replacement in existing panels, and a proven track record in demanding environments. Its 20 A rating provides a balanced blend of protection and practical usability for mid-sized three-phase circuits, helping facility managers keep critical systems running smoothly while maintaining safety margins.

Whether you’re stocking for an urgent panel upgrade, designing a new three-phase distribution, or upgrading motor protection for HVAC and process equipment, the Siemens Q320HH 20A 3-Pole 240 V Circuit Breaker Potential Transformer delivers targeted protection with dependable performance. Ideal for electricians, panel builders, and facility engineers who demand clarity, reliability, and seamless integration in their protection strategy.