Key features
Eaton’s IZM9 series comprises a comprehensive range of technically mature and reliable air circuit breakers with rated currents up to 6300 A. Available in three frame sizes, they offer an ideal, cost-effective solution for any project.
More than 100,000 of these exceptionally robust circuit breakers are already in use in harsh industrial environments worldwide. Key features include substantial material thickness and high short-time withstand current ratings.
Applications
Depending on the type of equipment being protected, this circuit breaker can be used in four main application areas:
• System protection
• Motor protection
• Transformer protection
• Generator protection
By selecting different models of control units, the switching requirements for these applications can be fully met.
Technical parameters
| Standard | Standard | IEC/EN 60947 | IEC/EN 60947 | IEC/EN 60947 | IEC/EN 60947 | IEC/EN 60947 | IEC/EN 60947 | IEC/EN 60947 | IEC/EN 60947 |
|---|---|---|---|---|---|---|---|---|---|
| Ambient temperature | Storage | -25-85 | -25-85 | -25-85 | -25-85 | -25-85 | -25-85 | -25-85 | -25-85 |
| Ambient temperature | Operation | -25-85 | -25-85 | -25-85 | -25-85 | -25-85 | -25-85 | -25-85 | -25-85 |
| Utilization category | Utilization category | B | B | B | B | B | B | B | B |
| Protection degree | Protection degree | IP20 | IP20 | IP20 | IP20 | IP20 | IP20 | IP20 | IP20 |
| Ambient humidity | Ambient humidity | Complies with GB/T2423.4 alternating damp heat test, +55℃, relative humidity 95%, no condensation. If exceeding the standard, additional cabinet protection is required | Complies with GB/T2423.4 alternating damp heat test, +55℃, relative humidity 95%, no condensation. If exceeding the standard, additional cabinet protection is required | Complies with GB/T2423.4 alternating damp heat test, +55℃, relative humidity 95%, no condensation. If exceeding the standard, additional cabinet protection is required | Complies with GB/T2423.4 alternating damp heat test, +55℃, relative humidity 95%, no condensation. If exceeding the standard, additional cabinet protection is required | Complies with GB/T2423.4 alternating damp heat test, +55℃, relative humidity 95%, no condensation. If exceeding the standard, additional cabinet protection is required | Complies with GB/T2423.4 alternating damp heat test, +55℃, relative humidity 95%, no condensation. If exceeding the standard, additional cabinet protection is required | Complies with GB/T2423.4 alternating damp heat test, +55℃, relative humidity 95%, no condensation. If exceeding the standard, additional cabinet protection is required | Complies with GB/T2423.4 alternating damp heat test, +55℃, relative humidity 95%, no condensation. If exceeding the standard, additional cabinet protection is required |
| Power incoming direction | Power incoming direction | Top or bottom incoming as required; protection and measurement functions work normally | Top or bottom incoming as required; protection and measurement functions work normally | Top or bottom incoming as required; protection and measurement functions work normally | Top or bottom incoming as required; protection and measurement functions work normally | Top or bottom incoming as required; protection and measurement functions work normally | Top or bottom incoming as required; protection and measurement functions work normally | Top or bottom incoming as required; protection and measurement functions work normally | Top or bottom incoming as required; protection and measurement functions work normally |
| Rated current (In) | Rated current (In) | 630, 800, 1000, 1250, 1600 | 630, 800, 1000, 1250, 1600 | 630, 800, 1000, 1250, 1600 | 800, 1000, 1250, 1600, 2000, 2500, 3200, 4000 | 800, 1000, 1250, 1600, 2000, 2500, 3200, 4000 | 800, 1000, 1250, 1600, 2000, 2500, 3200, 4000 | 4000, 5000, 6300 | 4000, 5000, 6300 |
| Circuit breaker type | Circuit breaker type | B | N | H | B | N | H | N | H |
| Rated impulse withstand voltage (Uimp, VAC) | Rated impulse withstand voltage (Uimp, VAC) | 12000 | 12000 | 12000 | 12000 | 12000 | 12000 | 12000 | 12000 |
| Rated insulation voltage (Ui, VAC) | Rated insulation voltage (Ui, VAC) | 1000 | 1000 | 1000 | 1000 | 1000 | 1000 | 1000 | 1000 |
| Rated operational voltage (Ue, VAC) | Rated operational voltage (Ue, VAC) | 690 | 690 | 690 | 690 | 690 | 690 | 690 | 690 |
| Rated ultimate short-circuit breaking capacity (Icu, kA) | 440V 50/60Hz | 42 | 50 | 66 | 66 | 85 | 100 | 85 | 100 |
| Rated ultimate short-circuit breaking capacity (Icu, kA) | 690V 50/60Hz | 42 | 42 | 42 | 66 | 85 | 85 | 85 | 100 |
| Rated service short-circuit breaking capacity (Ics, kA) | 440V 50/60Hz | 42 | 50 | 50 | 66 | 85 | 100 | 85 | 100 |
| Rated service short-circuit breaking capacity (Ics, kA) | 690V 50/60Hz | 42 | 42 | 42 | 66 | 85 | 85 | 85 | 100 |
| Rated short-time withstand current (Icw, kA) | 1s | 42/- | 42/- | 42/- | 66 | 85 | 85 | 85 | 100 |
| Rated short-circuit making capacity (Icm, kA) | 440V 50/60Hz | 88 | 105 | 145 | 145 | 187 | 220 | 187 | 220 |
| Rated short-circuit making capacity (Icm, kA) | 690V 50/60Hz | 88 | 88 | 88 | 145 | 187 | 187 | 187 | 220 |
| Closing and opening times(ms) | Closing time | 30 | 35 | 35 | |||||
| Closing and opening times(ms) | Opening time | 25 | 30 | 30 | |||||
| Maximum operating frequency (Operations / hour) | Maximum operating frequency (Operations / hour) | 60 | 60 | 60 |
Note:
1) The electrical life of 4000A is 5000 cycles.
2) IN91/97/99 is a circuit breaker with isolation function. According to Appendix L of GB14048.2-2008/IEC 60947-2, the PXR series electronic trip unit is removed from the IZM91/97/99 circuit breaker; the remaining configuration is the same as the standard circuit breaker. When used in conjunction with an external protective relay (maximum delay 400ms), the breaking capacity (at maximum rated operating voltage Ue) can reach the rated short-time withstand current value Icw (1 second).
