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Siemens MD63B700 Molded Case Circuit Breaker
- 700A
- 3 Pole
- Unit Mount
Siemens
MD63B700
Molded Case Circuit Breaker
Brand
Siemens
SKU
MD63B700
Quantity
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Siemens MD63B700 - 700A 3 Pole Molded Case Circuit Breaker
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Description
Designed for robust industrial distribution, this 700A molded case breaker delivers 50kAIC interrupting capacity at 480VAC. The MD6 frame utilizes a thermal-magnetic trip unit with adjustable magnetic settings to fine-tune short-circuit response. It installs seamlessly into Siemens motor control centers, SB switchboards, and FPP panelboards. While currently active, facilities planning future transitions can migrate to the newer 3VA65 series utilizing an approved manufacturer retrofit kit.Specifications
| Brand | Siemens |
|---|---|
| Part Number | MD63B700 |
| Series | MD6 |
| Amperage | 700A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 65kA @ 240VAC, 50kA @ 480VAC, 25kA @ 600VAC, 25kA @ 250VDC |
| Frame Type | MD |
|---|---|
| Terminal Type | Lugs |
| For Use With | Siemens S4, S5, P4, P5, SPP, FPP Panelboards, SB1, SB2, SB3 Switchboards, Motor Control Centers |
| Wire Gauge | (3) 1/0 AWG - 500 kcmil (Al/Cu) |
| Max Wire | 500 kcmil |
| Min Wire | 1/0 AWG |
| 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 |
|---|---|
| Accessories | Line and Load Side Lugs (TA3K500) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Interchangeable Trip Unit |
Product FAQs
8 answersWhich Siemens panelboards and switchboards accept the MD63B700 breaker?
This 700A MD frame breaker is compatible with Siemens S4, S5, P4, P5, SPP, and FPP panelboards. It also installs seamlessly into SB1, SB2, and SB3 switchboards, as well as Siemens motor control centers.
What lug kit is used with the MD63B700, and what is the wire range?
The standard line and load lug kit is the Siemens TA3K500. It accepts three 1/0 AWG to 500 kcmil aluminum or copper conductors per phase.
How does the adjustable magnetic trip function work on the MD63B700?
The thermal-magnetic trip unit features a fixed thermal element for standard overload protection and an adjustable magnetic element. This allows panel builders to fine-tune the instantaneous short-circuit trip threshold based on specific load requirements.
Can the trip unit in the MD63B700 be swapped if load requirements change?
Yes, the Siemens MD frame features an interchangeable trip unit design. This allows electricians to replace the thermal-magnetic trip unit without having to remove or replace the entire breaker frame.
What does unit mount mean for the MD63B700 installation?
As a unit-mount breaker, it bolts directly to the mounting surface or enclosure backpan rather than plugging onto a busbar. It utilizes feed-thru lug connections for both the line and load sides.
Can the MD63B700 replace legacy I-T-E circuit breakers?
Yes, this Siemens Sentron breaker serves as a direct replacement for older I-T-E and Siemens MD frame breakers with matching 700A and 600V specifications.
What is the modern replacement series for the MD63B700?
While the MD63B700 remains an active Sentron series breaker, facilities planning future upgrades can migrate to the newer Siemens 3VA65 series utilizing an approved manufacturer retrofit kit.
Is the MD63B700 approved for HVAC equipment?
Yes, this breaker is HACR rated. It is safely approved to provide group motor protection for heating, air conditioning, and refrigeration applications.
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