IEC UL 499 Figure SB4.1 Test Pin

The IEC UL 499 Figure SB4.1 Test Pin is a precision safety tool designed to verify protection against access to hazardous live parts in electrical equipment—especially motor-driven devices and industrial control systems. Its slim 3mm conductive metal probe navigates tight gaps (e.g., terminal slots, chassis seams) to detect hidden dangers, while a 25mm insulating baffle plate prevents over-insertion. Paired with a compact 10mm-diameter insulated handle for precise control, it features a cable-free design (compatible with optional low-voltage test supplies) and applies a controlled 20N thrust to mimic accidental tool contact. Strictly compliant with UL and IEC standards, it’s essential for manufacturers to prevent electric shock and meet global equipment safety regulations.

NOTE: Please note SMT-S2962 is without cable. If you want to test with Low-voltage supply with LISUN model SMT-529CV, you may choose SMT-1213C with cables. 

Standards:

Specifications:
Tool Type: IEC UL 499 Figure SB4.1 Test Pin (for hazardous live part testing in motors, generators, and electrical equipment)
Probe Material: Conductive metal (resistance ≤ 0.1Ω; corrosion-resistant; rigid, no deformation under 20N force)
Handle/Baffle Material: Insulated plastic (handle resistance ≥ 100MΩ; heat-resistant up to 110°C; baffle for over-insertion protection)
Key Dimensions:
– Probe Diameter: 3mm ± 0.05mm
– Probe Length: 15mm ± 0.1mm
– Baffle Plate Diameter: 25mm ± 0.2mm
– Baffle Plate Thickness: 4mm ± 0.05mm
– Handle Diameter: 10mm ± 0.3mm
– Handle Length: 20mm ± 0.2mm
Applied Thrust: 20N ± 2N (simulates accidental small tool contact; aligns with UL/IEC test requirements)
Cable Configuration: Cable-free design (compatible with optional low-voltage test supplies for extended functionality)
Core Function: Tests access to hazardous live parts via 3mm probe; blocks over-insertion with baffle; ensures UL/IEC compliance

Test Procedures:
1. Inspect the test pin for bent tips, cracked insulation, or loose baffles; confirm conductivity with a test tool.
2. Power on the equipment under test (EUT, e.g., a motor control box) and set it to normal operating mode.
3. Hold the insulated handle, align the 3mm probe with EUT gaps (terminal slots, chassis seams).
4. Apply steady 20N thrust to advance the probe—stop if the 25mm baffle touches the EUT.
5. Check the connected live-part detector for signals (indicating contact with hazardous parts).
6. Record results: Pass if no contact; Fail if the probe reaches dangerous components.

Applications:
1. Testing terminal slot gaps in industrial motor control boxes (per UL 499:2023 Figure SB4.1) to block access to live wiring.
2. Verifying generator chassis seams (compliant with IEC 61032:2017 Figure 9) to prevent contact with internal circuits.
3. Safety checks for electric tool battery compartment slots (per UL 60335-1:2023) to avoid hazardous part access.
4. Quality control for small generator stator windings during manufacturing, ensuring UL 499 compliance.
5. Post-production testing of motor-driven pump control panels to meet global electrical equipment safety standards.

IEC UL 499 Figure SB4.1 Test Pin