Brand: SIEMENS
Category: Control Unit
Document Type: Manual
Language: EN
Manual for NXAIR P
Uploaded: Nov. 21, 2025, 6:01 p.m.
Manual Publish Date: 2002-02-22
Warranty Information
Warranty information is contained within the sales contract and is the sole warranty provided by Siemens.
Operation Summary
The NXAIR P switchgear is designed for medium-voltage indoor operation. It consists of modular sections that can be combined as needed, including circuit breaker, disconnecting, metering, and bus sectionalizer modules. Key operational features include:
- Easy operation of switching, disconnecting, and grounding functions from the section front.
- Clear assignment of control elements to mechanical switch position indicators.
- Integration of mechanical switch position indicators on the mimic diagram.
- Logic mechanical interlocks to ensure correct operation.
- Circuit breaker operation can be manual or electrical.
- The truck mechanism allows for moving the circuit breaker between disconnected, test, and connected positions.
Safety is paramount, with procedures for de-energizing, grounding, and using protective equipment outlined. The manual also details maintenance schedules and troubleshooting for reliable performance.
Troubleshooting and error codes
| Fault/Trouble | Cause | Remedy/Solution |
|---|---|---|
| 3AK1 Insertion/Withdrawal | ||
| Cassette release handle cannot be lifted | Circuit breaker not in D(isconnected) position | Rack circuit breaker to D(isconnected) position |
| Cassette release handle cannot be lifted | Circuit breaker not OPEN | OPEN circuit breaker |
| Cassette release handle cannot be lowered | Circuit breaker not fully inserted | Push circuit breaker and dolly fully into the compartment |
| Cassette release handle cannot be lowered | Cassette release handle not fully lifted | Lift cassette release handle until it is horizontal |
| Circuit breaker cannot be fully inserted into compartment | Circuit breaker not in D(isconnected) position and cassette release handle not fully lifted | Rack circuit breaker to D(isconnected) position and then lift cassette release handle |
| Circuit breaker cannot be with-drawn | Incompatible coding of circuit breaker and compartment | Use properly rated circuit breaker for the compartment |
| Circuit breaker cannot be with-drawn | Cassette release handle not fully lifted | Lift cassette release handle until it is horizontal |
| Circuit breaker cannot be with-drawn | Circuit breaker not in D(isconnected) position and cassette release handle not fully lifted | Rack circuit breaker to D(isconnected) position and then lift cassette release handle |
| Front door cannot be closed due to interference with cassette release handle | Cassette release handle not fully lowered | Lower cassette release handle until it is vertical |
| 3AK1 Circuit breaker Racking | ||
| Racking release slider cannot be depressed by the racking crank | Circuit breaker not OPEN | OPEN circuit breaker |
| Racking release slider cannot be depressed by the racking crank | Racking mechanism is locked | Remove or open the lock |
| Racking release slider cannot be depressed by the racking crank | Switchgear interlocks are active | Observe switchgear interlocking |
| Racking release slider cannot be depressed by the racking crank | Front door not closed and latched | Close and latch front door |
| Racking release slider cannot be depressed by the racking crank | Operating tool for grounding switch is inserted in cassette | Remove the operating tool for the grounding switch |
| Racking release slider cannot be depressed by the racking crank | Grounding switch is closed | Open the grounding switch |
| 3AK1 Circuit-breaker | ||
| Circuit breaker cannot be closed | Circuit breaker is in a transient position | Rack circuit breaker into desired position (disconnected, test, or connected) |
| Circuit breaker cannot be closed | Racking crank has not been removed from the cassette | Remove the racking crank |
| Circuit breaker cannot be closed | Closing springs are not charged | Electric spring charging requires about 12 seconds. Observe spring charge status indicator |
| Closing spring not automatically (electrically) charging | Mechanism is locked in OPEN position | Remove or open lock |
| Closing spring not automatically (electrically) charging | Switchgear interlocks are active | Observe switchgear interlocking |
| Closing spring not automatically (electrically) charging | Mechanism is locked in OPEN position | Remove or open lock |
| Closing spring not automatically (electrically) charging | No control power present | Turn on control power |