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The HOBBYWING 300A Safety E-power Switch is a high-performance anti-spark module designed for industrial drones and electric systems. It supports up to 18S high-voltage lithium polymer batteries, delivering stable 300A continuous current under efficient cooling (5m/s wind).
Its advanced electronic switch enables real-time power control, preventing accidental motor movement, while delayed power-on technology eliminates sparks and noises, extending ESC and connector life.
Encased with full glue encapsulation, it achieves IP67 waterproof and dustproof protection, ensuring reliable operation in harsh environments (-40°C~65°C).
With over 1000 hours of aging tests and 300+ flight verifications, this module guarantees long lifespan, safety, and stability for heavy-duty UAV systems.




| Product Name | 300A Safety E-power Switch 14S-300A |
|---|---|
| Specification | 14S-300A |
| Input voltage | 36V-60.9V |
| Current (good heat dissipation) | 300A |
| Volume (with screw holes) | 98.0*90.0*24.0mm |
| Weight | 518.5±5g |
| Product Name | 300A Safety E-power Switch 18S-300A |
|---|---|
| Specification | 18S-300A |
| Input voltage | 36V-78.3V |
| Current (good heat dissipation) | 300A |
| Volume (with screw holes) | 98.0*90.0*24.0mm |
| Weight | 518.5±5g |
A1: SEPS 300A Safety E-power Switch: It is an upstream anti-spark on/off module, not a motor controller. The ordered 14S or 18S version must match the aircraft voltage and worst-case bus current.
A2: SEPS 300A Safety E-power Switch: It must match a high-voltage LiPo installation. Verify voltage range, battery chemistry, full-charge voltage, polarity, insulation and the complete power train against the delivered label and current manual.
A3: SEPS 300A Safety E-power Switch: The listing rates it for 300A continuous only with effective 5m/s cooling. That condition must be reproduced or the integrator must apply a lower approved limit.
A4: SEPS 300A Safety E-power Switch: The 300A figure is explicitly conditional on 5m/s airflow, so enclosure temperature, mounting and blocked airflow must be reviewed rather than treating 300A as unconditional.
A5: SEPS 300A Safety E-power Switch: It does not match motor timing or propellers; it sits upstream of the ESC and must be sized for the combined propulsion-system current and inrush behavior.
A6: SEPS 300A Safety E-power Switch: The page describes electronic switch control and delayed power-on, but no CAN, PWM or telemetry command protocol. Use only the supplied control wiring and manual.
A7: SEPS 300A Safety E-power Switch: The switch helps prevent unintended motor energizing and delays full power by about four seconds, but the page does not claim a redundant control channel.
A8: SEPS 300A Safety E-power Switch: No field firmware or parameter programming is advertised for this power switch. Any change to control logic needs manufacturer approval.
A9: SEPS 300A Safety E-power Switch: The official product page lists 6AWG input/output wiring. Confirm delivered cable length, terminals, polarity and the exact control-wire pinout for the selected voltage version.
A10: SEPS 300A Safety E-power Switch: The listed body is 98 x 90 x 24mm and 518.5g. Allow space for mounting holes, heavy cable bends, strain relief and cooling clearance.
A11: SEPS 300A Safety E-power Switch: The encapsulated module is listed as IP67, but connectors and the complete installed system may have a lower rating and still need protection from salt, chemicals and standing water.
A12: SEPS 300A Safety E-power Switch: The storefront description states -40°C to 65°C. Current capacity and cable behavior still depend on real cooling and the final manual.
A13: SEPS 300A Safety E-power Switch: No live current, voltage or temperature telemetry output is stated for this switch, so system monitoring must come from other approved equipment.
A14: SEPS 300A Safety E-power Switch: No onboard flight or fault log is advertised. Diagnose the wider power system with approved measurements after making the aircraft safe.
A15: SEPS 300A Safety E-power Switch: It provides no propeller-positioning function; that belongs to a compatible IPC ESC and motor system.
A16: SEPS 300A Safety E-power Switch: No regulated BEC output is listed. It switches the propulsion bus and must not be used as an avionics power supply.
A17: SEPS 300A Safety E-power Switch: Choose the 14S or 18S variant explicitly. The final quote should list the module, control switch or lead, heavy-current cables, terminals, mounting hardware and manual.
A18: SEPS 300A Safety E-power Switch: Install it in the high-current bus with verified polarity, short supported cables, strain relief and the specified cooling; do not place it where an accidental command can energize exposed propellers.
A19: SEPS 300A Safety E-power Switch: First testing should use propellers removed, current protection, the correct battery voltage and the documented switch sequence. Confirm the roughly four-second delayed energization before flight.
A20: SEPS 300A Safety E-power Switch: If it sparks, fails to close or powers late beyond the documented delay, disconnect the battery physically and inspect polarity, control wiring, connectors, load faults and module condition.
A21: SEPS 300A Safety E-power Switch: Inspect potting, enclosure, mounting, 6AWG leads, terminals and the control switch for impact, corrosion, heating or looseness; the module should not be opened in the field.
A22: SEPS 300A Safety E-power Switch: A commercial fleet should stock the exact voltage variant plus matched control leads and high-current connectors, sized from fleet count and supplier lead time.
A23: SEPS 300A Safety E-power Switch: Confirm 14S versus 18S, the delivered voltage window, conditional 300A rating, cable specification, dimensions, weight, IP rating, control method, delay and current manual.
A24: SEPS 300A Safety E-power Switch: Request the current SEPS wiring diagram, mounting drawing, standby-current guidance, warranty route and written confirmation of the chosen voltage version.
A25: SEPS 300A Safety E-power Switch: Choose this 300A version only when verified bus demand and margin exceed the smaller switch's approved range and the aircraft can accept its 518.5g weight and cooling needs.
✓ Keep Clean: Wipe the earphone surfaces with a soft, dry cloth regularly. Avoid using water or harsh chemicals.
✓ Store Safely: When not in use, store your earphones in a protective case to prevent damage and tangling.
✓ Avoid Moisture: Keep earphones away from moisture, including rain and sweat, to protect the internal components.
✓ Cable Management: Gently wrap the cable without tight coils or bends to avoid damage over time.
✓ Periodic Cleaning: Clean the ear tips and mesh gently with a dry brush to remove dust or earwax for optimal sound quality.
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