Panduit DNF18-250FIM-L Pan-Term Fully Insulated Female Disconnect Terminal
The Panduit DNF18-250FIM-L is a fully insulated female disconnect terminal designed for 18-22 AWG wire and 0.250" × 0.032" tab connections. Built for commercial electrical terminations in access control, power distribution, and low-voltage systems, this terminal delivers tool-free disconnect capability with nickel-plated brass contacts and nylon insulation rated to 221°F (105°C). UL 310 and CSA 22.2 No. 153 listed to 600V, it addresses integrators' need for code-compliant, field-serviceable connections in panel builds, door hardware, and auxiliary power circuits where repeated connect/disconnect cycles are common.
Key Features
- 18-22 AWG wire range with 0.250" × 0.032" tab — fits standard quick-disconnect applications in access panels and power supplies
- Fully insulated nylon housing prevents accidental contact and short circuits in dense terminal blocks
- Internal barrel serrations grip stranded wire for maximum tensile strength and low-resistance contact
- Tool-free insertion and removal reduces labor cost during troubleshooting and panel rework
- Nickel-plated finish resists corrosion in humid or outdoor-rated enclosures
- UL 94V-2/HB flammability rating and 600V UL/CSA certification for code-compliant installs
- Internal wire stop ensures correct insertion depth — prevents under-crimped failures
- Red color-coding for hot-wire identification per NEC best practices
The DNF18-250FIM-L uses Panduit's Pan-Term barrel design with internal serrations that bite into stranded copper during crimping. This creates multiple contact points along the wire bundle, distributing mechanical stress and reducing the risk of strand breakage under vibration or thermal cycling. The fully insulated nylon body extends to the barrel crimp, eliminating exposed metal and meeting touch-safe requirements for UL 508A industrial control panels and UL 294 access control installations. The 0.250" tab width is the most common size in commercial 12-24VDC circuits, matching terminals on electromagnetic locks, power supplies, relay modules, and card reader pigtails. The 0.032" tab thickness pairs with standard male quick-disconnect tabs (Panduit DNF series or equivalent), providing 15-20 lb insertion force for secure retention without requiring locking tabs.
Integrators installing access control panels, intrusion systems, or distributed power architectures use these terminals to build field-serviceable wiring harnesses. The tool-free disconnect feature allows technicians to isolate circuits for testing or swap components without cutting wires — critical in retrofit jobs where original wire length is limited. The internal wire stop, visible as a shoulder inside the barrel, prevents over-insertion that can cause strand contact with the insulation crimp, a common failure mode in bargain terminals. Panduit specifies crimp tooling (CT-1525, CT-2300/ST, CT-2500/L, or UP14ZLW) to achieve the required 360° radial compression; improper crimping with pliers or adjustable tools voids the UL listing and creates high-resistance joints prone to heating. The nickel-plated brass contact maintains conductivity in typical commercial environments; for coastal or industrial applications with salt spray or chemical exposure, consider tin-plated variants.
UL 310 and CSA 22.2 No. 153 certification to 600V makes the DNF18-250FIM-L suitable for both Class 1 (line-voltage) and Class 2 (limited-energy) circuits per NEC Article 725, provided the wire gauge and insulation ratings match the circuit's requirements. The UL 94V-2 flammability rating meets the self-extinguishing requirement for enclosed equipment but does not qualify for plenum spaces; use DNF terminals only in riser-rated or general-purpose enclosures. Supplied in 50-piece bags (250 per carton), the terminal's red insulation supports color-coded wiring schemes common in multi-circuit panels, reducing troubleshooting time when tracing power feeds through crowded backplanes.
