KJD17B Electro Magnetic Switch

KJD17B Electro Magnetic Switch – Industrial Safety No-Volt Release (NVR) Push Button Switch

The KJD17B Electro Magnetic Switch (manufactured by KEDU) is a high-performance safety push-button switch designed to provide zero-voltage release (NVR) and emergency power cut-off protection for industrial power tools, stationary machinery, and workshop equipment. Built to protect operators from unexpected restarts following power outages, the KJD17B Electro Magnetic Switch automatically trips to the “OFF” position if incoming AC voltage drops or disconnects.

As shown in the product image, the switch features dual green (“ON”) and red (“OFF”) push buttons housed behind a transparent, flexible PVC dust/waterproof cover. The assembly is mounted on a yellow frame collar with a snap-in or screw-mount base. Internal electromagnetic holding coils continuously hold the internal contacts closed during operation, releasing them instantly upon power loss.

Key Features of the KJD17B Electro Magnetic Switch

Zero-Voltage / Under-Voltage Protection: Prevents dangerous, automatic machinery restart after power outages by opening internal contacts when power drops.
IP54 / IP55 Weatherproof Shield: Protected by a transparent PVC cover that seals the push-button mechanism against fine sawdust, oil, and water splashes.
4-Pin or 5-Pin Terminal Options: Available with 4-terminal setups ( $2text{NO}$ ) or 5-terminal variants containing an auxiliary coil terminal ( $A1$ ) for connecting external remote trip e-stops.
Double Pole Cut-Off Circuitry: Disconnects both live ( $L$ ) and neutral ( $N$ ) power lines simultaneously, providing electrical isolation when switched off.
High-Current Carrying Capacity: Handles resistive and inductive motor switching loads up to $16text{ A}$ ( $2text{ HP}$ rating).
Certified Safety Standards: Tested and compliant under global certifications, including UL508, TÜV (EN61058), VDE, CE, and RoHS standards.

Common Applications and Industrial Usage

The restart prevention safety feature of the KJD17B Electro Magnetic Switch makes it a standard component across woodworking and metalworking machinery:

Table Saws & Band Saws: Serves as the primary power switch to prevent unexpected blade spin-up when power returns after a power outage.
Wood Lathes & Router Tables: Controls motor activation while providing rapid power isolation via its prominent red STOP button.
Drill Presses & Bench Grinders: Fitted onto benchtop and floor-standing workshop machinery requiring IP54 dust protection.
Industrial Meat Slicers & Wood Splitters: Protects commercial food processing machines and hydraulic splitters against unintended power restoration hazards.

Technical Specifications

The electrical limits, coil options, and mechanical mounting specifications of the KJD17B Electro Magnetic Switch conform to industrial control standard EN61058:

Parameter Specification	Technical Details & Operational Values
Component Classification	Electromagnetic NVR Safety Push Button Switch
Primary Target Keyword	KJD17B Electro Magnetic Switch
Operating Line Voltage ( $U_e$ )	$120text{ VAC}$ or $220text{--}240text{ VAC}$ ( $50/60text{ Hz}$ )
Coil Nominal Voltage ( $U_c$ )	$110/120text{ VAC}$ or $220/240text{ VAC}$
Rated Contact Current	$16text{ A}$ ( $12text{ A}$ AC-3 inductive rating)
Motor Power Rating	$1/2text{ HP @ }120text{ V}$ to $2text{ HP @ }240text{ V}$ ( $2.2text{ kW}$ )
Number of Terminals	4-Pin / 5-Pin ( $6.3text{ mm} times 0.8text{ mm}$ spade connectors)
Enclosure Protection Class	IP54 / IP55 (With rubber gasket and button cover)
Mechanical Life Cycle	50,000 Operations ( $5text{E}4$ )
Panel Cutout Mounting Size	Approx. $46text{ mm} times 22text{ mm}$ (Standard rectangular cutout)

Installation Guidelines and Best Practices

Safety Warning: Disconnect the machine from main AC wall outlets before inspecting wires or installing replacement switches.

Distinguish 4-Pin vs. 5-Pin Connections: Verify whether your existing setup uses a 4-pin arrangement (line in $13/23$ , load out $14/24$ ) or a 5-pin arrangement ( $A1$ coil terminal for auxiliary remote-trip circuits).

Verify Coil Voltage Requirements: Ensure the supply line voltage matches the coil rating specified on the switch side label ( $120text{ V}$ coil vs $230text{ V}$ coil) to prevent coil chatter or burnouts.

Maintain Waterproof Seals: Seat the surrounding rubber sealing flange firmly against the panel cutout surface to maintain its dust and water protection rating.

To review official safety switch datasheets, wiring connection schematics, and complete industrial switch catalogs, check the global KEDU Industrial Controls Directory.

To request a fast commercial quote or evaluate real-time regional warehouse stock availability for bulk procurement needs, please connect with our sales branch via the Control Qatar Contact Page.