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HNX3B900
HNX3B900
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HNX3B900 Specifications
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HNX3B900, Siemens, VL Series, Type HNX, P, PH, A, V, , high interrupting capacity, 40°C, Bolt-On, complete with non-interchangeable trip unit, lugs not included, suitable for reverse fed applications, Thermal Magnetic molded case circuit breakers
| Manufacturer | Siemens | Subcategory | Molded Case |
| Family | VL Series | Protection | Thermal Magnetic |
| Connection | Bolt-On | ||
| Manufacturer | Siemens | ||
| Subcategory | Molded Case | ||
| Family | VL Series | ||
| Protection | Thermal Magnetic | ||
| Connection | Bolt-On |
Electrical.com is NOT an authorized distributor for Square D and therefore the manufacturer’s warranty does not apply. This product does include an Electrical.com 2 year warranty.
We can test, inspect and repair your HNX3B900. All repairs include a 2-Year Electrical.com Warranty.
The Siemens HNX3B900 is a ‑pole, amp thermal‑magnetic molded‑case circuit breaker from Siemens’ HNX series, engineered to provide robust overcurrent protection in commercial and light industrial power distribution systems. Designed for use in panelboards and switchboards that accept Siemens H‑frame breakers, the HNX3B900 is suitable for protecting three‑phase feeder circuits, sub‑feeds, and equipment disconnects up to its 100 A continuous rating. Its ‑pole configuration ensures that all three ungrounded conductors are simultaneously disconnected under overload or short‑circuit conditions, supporting NEC code compliance and safe multi‑phase operation.
Electrically, the HNX3B900 employs a thermal‑magnetic trip mechanism that combines a heat‑sensitive element for long‑time overload protection with a magnetic instantaneous trip for rapid interruption of high‑fault currents. This design allows the breaker to tolerate harmless inrush currents (such as those from motor starting) while still providing reliable fault clearing when required. The breaker is UL 489 listed with a {aic rating}. The amp rating places the HNX3B900 in a category suitable for mid‑sized feeder circuits and three‑phase loads requiring dependable, consistent protection.
Mechanically, the HNX3B900 features a bolt‑on mounting design that ensures secure attachment to compatible panelboard bus systems, reducing risk of loosening due to vibration or movement. The molded‑case construction and manual toggle actuator provide clear ON/OFF position indication and straightforward resetting after trip events. The breaker accepts standard conductor sizes rated for its amperage and integrates with Siemens accessory options such as auxiliary contacts, shunt trips, and handle ties for expanded control and signaling functions when needed. With its balance of reliable performance, standardized form factor, and broad compatibility, the Siemens HNX3B900 is a practical choice for three‑phase branch and feeder circuit protection in commercial and industrial applications.