Features:
- The three-pole breaker combines switching with ETU10 electronic line protection.
- Long-time overload pickup and instantaneous short-circuit pickup are adjusted as different decisions.
- The supplied order configuration excludes auxiliary release and auxiliary/alarm-switch functions.
Continuous current establishes the load-carrying basis, while interrupting capacity describes the fault current the breaker can clear at the stated system voltage.
The LI characteristic separates the overload response from the instantaneous response without adding a separate short-time-delay stage.
Accessory omissions do not remove the ETU10 protection functions; they define which remote release and signaling circuits are outside the supplied scope.
The Siemens 3VL7712-1SB36-0AA0 SENTRON VL1250N Circuit Breaker may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Siemens 3VL7712-1SB36-0AA0 SENTRON VL1250N Circuit Breaker Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
How the ETU10 trip decisions are separated
- Long-time function: The L element responds to sustained overload according to the selected Ir pickup.
- Instantaneous function: The I element reacts when fault current crosses the instantaneous threshold.
- No S stage: The LI characteristic does not insert a separate short-time-delay function between L and I.
- Electronic evaluation: The ETU10 trip unit evaluates current for both documented protection functions.
How the current settings relate to the breaker rating
- Rated current: The breaker configuration is rated at 1250 A In.
- Overload window: Ir can be adjusted from 500 to 1250 A without changing the frame configuration.
- Instantaneous window: Short-circuit pickup is adjustable from 1.25 to 10 times In.
- Setting distinction: Ir governs long-time pickup, while the multiple of In belongs to instantaneous operation.
How breaking duty differs from load current
- Interrupting rating: Icu is 55 kA at 415 V AC for the documented breaker configuration.
- Meaning: The kA figure describes fault interruption and is not the continuous-load setting.
- Pole arrangement: All three poles participate in the protected line path.
- Coordination point: Cable, system, and upstream-device checks must use the correct continuous-current and fault-duty values.
What the supplied accessory scope excludes
- Auxiliary release: No auxiliary release is included in this order configuration.
- Signaling contact: No auxiliary/alarm switch is included.
- Protection retained: The ETU10 long-time and instantaneous functions remain part of the breaker.
- Wiring boundary: Remote release or status circuits require separately documented accessories rather than assumed terminals on this unit.