Siemens HMG3B800 Molded Case Circuit Breaker
- 800A
- 3 Pole
- Unit Mount
Quantity
Siemens HMG3B800 - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for high-capacity power distribution, the Siemens HMG3B800 is an 800A, 3-pole molded case circuit breaker. It is compatible with Siemens P4 and P5 panelboards, as well as standard switchboards and motor control centers. This VL Series MG frame unit utilizes an interchangeable thermal-magnetic trip mechanism to deliver precise long-time and instantaneous (LI) protection. With a 65kAIC rating at 480V, it ensures dependable performance in commercial and industrial environments.Specifications
| Brand | Siemens |
|---|---|
| Series | HMG |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC, 500VDC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 35kA @ 600VAC, 30kA @ 250VDC, 30kA @ 500VDC |
| Frame Type | MG |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens P4 Panelboards, Siemens P5 Panelboards, Switchboards, Motor Control Centers |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch, Lug Kits |
|---|---|
| Accessories | Mounting Hardware |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, High Interrupting Capacity, Interchangeable Trip Unit |
Product FAQs
7 answersWhat does the "H" in the HMG3B800 catalog number indicate?
The "H" designates a high interrupting capacity. The HMG3B800 provides a 65kAIC rating at 480VAC, compared to standard Siemens MG frame breakers which are typically rated at 35kAIC at 480VAC.
Are lugs included with the Siemens HMG3B800 circuit breaker?
No, the HMG3B800 is typically supplied without lugs. You must source the appropriate lug kit separately, such as the 3TA3MG500 or 3TA3MG600, based on your specific conductor size and material requirements.
Which panelboards are compatible with the HMG3B800?
This unit-mount breaker is designed for installation in Siemens P4 and P5 panelboards, as well as compatible Siemens switchboards and motor control centers.
What wire sizes do the compatible lug kits for the HMG3B800 accept?
The accepted wire size depends on the installed lug kit. The 3TA3MG500 kit accepts 1/0 AWG to 500 kcmil conductors, the 3TA3MG600 accepts 2 AWG to 600 kcmil, and the heavy-duty 3TA2MG750 kit accepts 500 to 750 kcmil copper or aluminum wire.
Can the HMG3B800 be applied to DC power systems?
Yes, this thermal-magnetic breaker is rated for DC applications, offering a 30kAIC interrupting rating at both 250VDC and 500VDC.
How is the trip unit adjusted on the HMG3B800?
The HMG3B800 features a thermal-magnetic trip unit with a fixed thermal element for long-time (L) overcurrent protection and an adjustable magnetic element for instantaneous (I) short-circuit protection.
Is the trip unit on the HMG3B800 interchangeable?
Yes, as part of the Siemens VL series MG frame family, the HMG3B800 features an interchangeable trip unit. This allows panel builders to swap trip units without replacing the entire breaker frame.
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