Square D 999330 Circuit Breaker
- 30A
- 3 Pole
- Bolt-On
Quantity
Square D 999330 3 Pole Circuit Breaker
Re-Certified
Quantity
Quantity
Square D 999330 3 Pole Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | 999330 |
| Series | ML-1 |
| Amperage | 30A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D ML Panelboards |
| Wire Gauge | AWG 14 to AWG 10, Cu, AWG 12 to AWG 10, AWG, Al |
| Max Wire | AWG 10 |
| Min Wire | AWG 14 |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | NEMA |
| Approval | UL, CSA |
| Temp Rating | 40 °C |
Quantity
Square D 999330 3 Pole Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Series | ML-1 |
| Amperage | 30A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D ML Panelboards |
| Wire Gauge | AWG 14 to AWG 10, Cu, AWG 12 to AWG 10, AWG, Al |
| Max Wire | AWG 10 |
| Min Wire | AWG 14 |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | NEMA |
| Approval | UL, CSA |
| Temp Rating | 40 °C |
Description
Square D 999330 3 Pole Circuit Breaker
The Square D 999330 is a 3 Pole thermal magnetic molded case circuit breaker with a current rating of 30 Amps and a voltage rating of 600V. It has an interrupting rating of 10kAIC at 600V. The 999330 has a bolt-on connection type and includes long time and instantaneous trip functions.
Specifications
| Brand | Square D |
|---|---|
| Part Number | 999330 |
| Series | ML-1 |
| Amperage | 30A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D ML Panelboards |
| Wire Gauge | AWG 14 to AWG 10, Cu, AWG 12 to AWG 10, AWG, Al |
| Max Wire | AWG 10 |
| Min Wire | AWG 14 |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | NEMA |
| Approval | UL, CSA |
| Temp Rating | 40 °C |
Product FAQs
6 answersWhat panelboards accept the Square D 999330 circuit breaker?
This 99 Series breaker is engineered specifically for legacy Square D ML panelboards. It is used to maintain and service older infrastructure where modern breakers will not fit.
What wire sizes are supported by the load lugs on the 999330?
The terminal lugs accommodate 14 AWG to 10 AWG copper conductors, or 12 AWG to 10 AWG aluminum conductors. Ensure proper torque specifications are followed during installation.
What protection functions are included in the 999330 trip unit?
It utilizes a fixed thermal-magnetic trip unit providing long-time and instantaneous (LI) protection. The thermal element responds to sustained overloads, while the magnetic element trips immediately during short circuits.
How is the 999330 secured within the panelboard?
It utilizes a bolt-on mounting configuration, which requires bolting the breaker directly to the panelboard bus. This provides a secure, high-vibration resistant connection compared to plug-on alternatives.
Is the 999330 breaker still in active production?
The 99 Series is a legacy product line. These breakers are typically sourced to support existing ML panelboards that require exact replacements without upgrading the entire enclosure.
What is the maximum short-circuit current the 999330 can safely interrupt?
It carries an interrupting rating of 10kA at 600V. Before installation, verify that the available fault current at the panelboard does not exceed 10,000 amps to ensure safe operation during a fault.
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