Weidmüller 999399 Terminal Block - Equivalent & Substitute Parts

Part Overview

The Weidmüller 999399 is an 11-position wire-to-board terminal block with 0.200" (5.08mm) pitch, designed for horizontal mounting with through-hole PCB installation. This component operates at 10 A and 300 V, accommodating wire gauges from 12-24 AWG with screw-clamping termination. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations.

Key Parameters

Parameter	Value
Positions Per Level	11
Pitch	0.200" (5.08mm)
Mating Orientation	Horizontal with Board
Current Rating	10 A
Voltage Rating	300 V
Mounting Type	Through Hole
Wire Termination	Screw-based
Features	Interlocking (Side)
Operating Temperature Range	-20°C ~ 100°C
Housing Material	Polyamide (PA66), Nylon 6/6
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the Weidmüller 999399 is determined by the following critical parameters:

Position Count & Pitch: Must maintain 11 positions at 0.200" (5.08mm) spacing to ensure PCB footprint compatibility
Electrical Ratings: Minimum 10 A current and 300 V voltage capability required
Mounting Configuration: Through-hole mounting with horizontal board orientation is mandatory
Termination Method: Screw-based wire termination is required for mechanical compatibility
Interlocking Feature: Side interlocking capability must be present for connector stability
Housing Material: Polyamide-based construction ensures thermal and mechanical performance

The Phoenix Contact 1729212 meets all substitution criteria within these parameters.

Parameter Comparison

Parameter	Weidmüller 999399	Phoenix Contact 1729212
Positions Per Level	11	11
Pitch	0.200" (5.08mm)	0.200" (5.08mm)
Mating Orientation	Horizontal with Board	Horizontal with Board
Current Rating	10 A	10 A
Voltage Rating	300 V	300 V
Wire Gauge	12-24 AWG	14-30 AWG
Mounting Type	Through Hole	Through Hole
Wire Termination	Screw - Clamping Yoke, Tension Sleeve	Screw - Rising Cage Clamp
Features	Interlocking (Side)	Interlocking (Side)
Housing Material	Polyamide (PA66), Nylon 6/6	Polyamide (PA), Nylon
Mounting Torque	0.4-0.5 Nm (4.6-4.4 Lb-In)	0.5-0.6 Nm (4.4-5.3 Lb-In)
Screw Thread	M2.5	M3
RoHS Status	RoHS Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active

Engineering Selection Recommendations

The Phoenix Contact 1729212 serves as a direct functional equivalent for the obsolete Weidmüller 999399. Both components share identical electrical ratings (10 A, 300 V), position configuration (11-position), pitch spacing (5.08mm), and mounting methodology (through-hole, horizontal orientation).

Key considerations for selection:

Product Status: The Phoenix Contact 1729212 maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete Weidmüller part.
Compliance: Both components meet RoHS requirements. The Phoenix Contact part carries ROHS3 compliance, representing current regulatory standards.
Wire Gauge Compatibility: The Phoenix Contact 1729212 accepts 14-30 AWG wire, which encompasses the Weidmüller specification range of 12-24 AWG. Wire gauges 14-24 AWG are directly compatible with both components.
Termination Differences: While termination mechanisms differ (clamping yoke versus rising cage clamp), both employ screw-based wire retention suitable for equivalent mechanical performance.
Torque Specifications: The Phoenix Contact part requires slightly higher mounting torque (0.5-0.6 Nm versus 0.4-0.5 Nm), reflecting the M3 screw thread versus M2.5 in the original design.

Frequently Asked Questions (FAQ)

Q: Can the Phoenix Contact 1729212 replace the Weidmüller 999399 on existing PCBs?

A: Yes. Both components share identical pitch (5.08mm), position count (11), and through-hole mounting configuration. PCB footprints are compatible. Wire gauge overlap (14-24 AWG) ensures electrical compatibility for standard applications.

Q: What is the difference in wire termination between these parts?

A: The Weidmüller 999399 uses a clamping yoke with tension sleeve mechanism, while the Phoenix Contact 1729212 employs a rising cage clamp design. Both are screw-based termination systems providing equivalent mechanical wire retention and electrical contact.

Q: Are there wire gauge limitations when substituting?

A: The Weidmüller part specifies 12-24 AWG, while the Phoenix Contact part accepts 14-30 AWG. For direct substitution, use wire gauges within the overlapping range of 14-24 AWG to ensure compatibility with both component specifications.

Q: Does the higher mounting torque of the Phoenix Contact part affect installation?

A: The Phoenix Contact 1729212 requires 0.5-0.6 Nm torque compared to 0.4-0.5 Nm for the Weidmüller part. This reflects the larger M3 screw thread. Standard installation procedures apply; ensure torque specifications are observed during assembly.

Q: Are both components RoHS compliant?

A: Yes. The Weidmüller 999399 is RoHS Compliant, and the Phoenix Contact 1729212 is ROHS3 Compliant, meeting current regulatory requirements for hazardous substance restrictions.

Q: What is the packaging difference?

A: The Weidmüller 999399 is supplied in standard packaging, while the Phoenix Contact 1729212 is available in bulk packaging. Verify packaging requirements for your procurement process.

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