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Schurter APO Pyro Fuse
1000VDC | 400A | ECU/BMS-Triggered
Schurter APO Pyro Fuse Overview
The Schurter APO is a pyrotechnic safety device (PSD) designed for active disconnection of high voltage DC circuits in electric vehicles and energy systems. Unlike passive fuses, it is triggered by a signal from the vehicle’s ECU or BMS, enabling controlled disconnection within 2ms in response to abnormal conditions such as short circuits or collisions. Rated at 1000VDC and 400A continuous current, it provides a highly reliable emergency disconnect solution for safety-critical applications.
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Product features
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ECU/BMS-triggered active disconnection — not a passive fuse
Total switching time: 1.0ms typical, 2.0ms maximum
Bolt-on A mounting via M8 screw to copper busbar
PA6 housing with copper alloy tin-plated terminals
Connector: AK-2 Code I (ISO 19072 AKII trigger interface)
Vibration and shock tested to LV 124-2 automotive standard
CE marked; RoHS, REACH and China RoHS compliant
Transportation Hazard Classification: UN3268, Class 9
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Compatible Applications
The APO is designed for active circuit protection across a range of high voltage systems:
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Electric vehicles (EVs)
Conventional vehicle electrical systems
Charging infrastructure
Photovoltaic (PV) and energy storage systems (ESS)
Household energy storage
Storage electric vessels
Fuel cell technologies
Aerospace (including eVTOL)
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Safety Information
The APO contains a pyrotechnic charge and must be handled, installed and transported in accordance with the following requirements. Failure to observe these instructions may result in death, serious injury or damage to equipment.
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Short-circuit ring: The connector has a shorting clip. If not fully inserted, it shorts the two pins to prevent accidental activation during transport, installation or use.
Ground isolation: The low-voltage trigger signal must be isolated from the high-voltage system ground. A common ground or connection is prohibited.
Breaking capacity: Do not use the APO if the fault current exceeds its rated breaking capacity. Contact Dalroad for guidance on higher current applications.
Dropped units: Do not use a unit that has been dropped. It must be inspected before any further use.
Physical damage: Do not use a unit with any damage to the body or components.
Triggering power source: Only use designated triggering equipment. Do not use lead-acid or dry-cell batteries.
Hot enclosure: Side panels can become hot during operation. Allow the unit to cool completely before touching. Follow mounting instructions carefully, ensuring all fastenings are tightened to specified torque values. Do not allow liquids or foreign objects to enter the product.
Transportation: UN3268, Class 9. Handle and ship in accordance with applicable dangerous goods regulations.
APO Technical Specifications
Technical specifications
| Parameter | Value |
|---|---|
| Rated voltage | 1000VDC |
| Rated current | 400A |
| Breaking capacity | 1000VDC / 16kA / 20µH |
| Internal resistance (@20°C) | ≤50µΩ (before breaking); ≥10MΩ (after disconnection) |
| Ignition resistance | ≥1.7Ω, ≤2.5Ω |
| Trigger current | ≥1.75A / 0.5ms or ≥1.2A / 2ms |
| No trigger current | ≤0.4A / ≤10s or ≤5A / ≤0.5µs |
| Monitoring current | <100mA |
| Current carrying capacity | 400A continuous @ 85°C (busbar size ≥120mm²) |
| Total switching time | 1.0ms typical, 2.0ms maximum |
| Mounting | Bolt-on A (M8 screw, copper busbar) |
| Operating temperature | -40°C to +105°C |
| Storage conditions | -40°C to +65°C; max. 70% r.h. @ 40°C |
| Housing material | PA6 |
| Terminal material | Copper alloy, tin-plated |
| Unit weight | <300g |
| Packaging unit | Bulk (18 pcs.) |
| Connector | AK-2 Code I |
| Approvals | CE |
| Compliances | RoHS, REACH, China RoHS |
APO Variants & Order Codes
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Current (A) |
Voltage (VDC) |
Breaking Capacity |
Connector Type |
Order No. |
|---|---|---|---|---|
|
400 |
1000 |
1000VDC / 16kA / 20µH |
AK-2 Code I |
3-158-119 |
Downloads & Documentation
APO Datasheet
Buy Schurter APO From the Official UK Distributor
Dalroad is the official UK distributor for Schurter. We have reliable stock of all their high voltage fuses, while our team supports design engineers through component selection, system integration and supply planning for safety-critical EV applications. Submit an enquiry to book a call with our technical experts or request a sample.