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Cleanroom Equipment Spare Parts
Pass Box Magnetic Lock
A compact fail-safe electromagnetic lock set for retaining an interlocked pass box door during the transfer sequence.
- Fail-Safe Electromagnetic Holding
- Matched Armature Plate
- Compact Chamber Mounting
- Two-Core Electrical Lead
Product Introduction
The pass box magnetic lock retains one transfer-chamber door while the opposite door is in use. The set combines a compact aluminum-bodied electromagnet, a matched armature plate, a stainless L-bracket and a short two-core lead for connection to the interlock controller. When correctly aligned, the floating armature seats evenly against the magnetic face and releases when power is removed. Replacement selection must match supply voltage, controller output, available mounting space, door geometry, holding requirement and the fail-safe sequence of the existing pass box.
Key Features
A compact rectangular body fits restricted header or side-jamb service spaces.
The stainless L-bracket provides slotted adjustment for face-to-face alignment.
A dedicated red-and-black lead simplifies polarity identification during replacement.
Customer Product Concerns
Reliable magnetic holding depends on electrical compatibility and full, parallel contact between the magnet face and armature.
A tilted armature contacts only one edge and substantially reduces holding force.The mounting bracket and armature position are adjusted to provide flat, parallel face contact when the door closes.
The wrong coil voltage can cause weak holding or premature coil failure.The lock voltage and current demand are matched to the pass box controller output before connection.
A rigidly mounted armature may not accommodate small door-alignment changes.The armature is installed with the intended limited compliance so it can seat evenly on the magnetic face.
Residual magnetism or incorrect control logic can delay door release.A compatible low-residual lock and fail-safe control sequence provide prompt release when the output is de-energized.
Typical Applications
Static pass box door interlocksDynamic pass-through chamber doorsMaterial transfer hatch lock replacementInterlocked cleanroom cabinet doors
Technical Parameters
Typical construction and dimensional ranges for compact pass box electromagnetic lock sets are shown below.
| Core Material | Laminated electromagnetic steel core with copper coil and matched steel armature plate |
|---|---|
| Panel Thickness | 25-45 mm nominal lock-body depth |
| Effective Width | 35-70 mm nominal lock-body width |
| Maximum Length | Up to 260 mm overall lock-body length |
| Steel Facing Thickness | 3-8 mm nominal armature face thickness |
| Core Density | 7700-7900 kg/m³ for electromagnetic steel components |
| Thermal Conductivity | 45-55 W/(m·K) for the steel magnetic circuit |
| Surface Finish | Brushed or anodized silver housing with passivated stainless mounting bracket |
| Joint Type | Face-contact electromagnet and armature with slotted L-bracket mounting and two-core lead |
| Customization | Available based on the intended application and operating environment. |
Available Options
Matched 12 VDC or 24 VDC coilAlternative bracket geometryLonger lead wireDoor-status monitoring contact
Planning a Pass Box Magnetic Lock specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
