Weidmüller 7940100402 Equivalent & Substitute Parts

Part Overview

The Weidmüller 7940100402 is a Transient Voltage Suppressor (TVS) device classified as SPD II 277V/40KA, designed for circuit protection applications. This component is currently listed as obsolete, necessitating identification of active equivalent models to maintain system functionality and ensure continued availability for new installations and replacements.

Substiute Parts

7940100402

WeidmüllerIn Stock: 10887940100402 Datasheet

Current PartRFQ

2730570000

WeidmüllerIn Stock: 9222730570000 Datasheet

MFR RecommendedRFQ

2730580000

WeidmüllerIn Stock: 7722730580000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete Weidmüller 7940100402 is determined by the following critical parameters:

• Voltage rating compatibility (277V nominal operating range)
• Discharge current capacity (40 kA nominal minimum)
• Circuit protection classification (Type 1 or Type 2 SPD)
• Mounting configuration (DIN Rail compatibility)
• Approval certifications (CE, cULus, VDE)

The two identified substitute parts—2730570000 and 2730580000—both maintain the required voltage and current ratings while offering active product status and enhanced availability.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain active product status with established supply chains. Selection between 2730570000 and 2730580000 depends on system architecture requirements:

2730570000 (VPU AC II US 1 277/50) is classified as Type 2 SPD with CE, cULus, and VDE certifications. This variant includes RoHS3 compliance and MSL rating of 1 (Unlimited), suitable for applications requiring comprehensive international approvals.

2730580000 (VPU AC II US 1 R 277/50) is classified as Type 1 SPD with cULus certification and Base + Module form factor. This configuration accommodates modular system designs where component replacement or upgrade is anticipated.

Both parts support 350V continuous operating voltage, exceeding the original 277V specification, and provide 50 kA maximum discharge current, surpassing the original 40 kA nominal rating.

Frequently Asked Questions (FAQ)

Q: Can 2730570000 and 2730580000 be used interchangeably with 7940100402?

A: Both parts meet or exceed the voltage and current protection requirements of the original component. Selection depends on whether Type 1 (2730580000) or Type 2 (2730570000) SPD classification is required by the installation standard and whether modular (Base + Module) or integrated form factor is specified.

Q: What is the difference between Type 1 and Type 2 SPD classification?

A: Type 1 devices (2730580000) are designed for installation between the main service entrance and branch circuit protection. Type 2 devices (2730570000) are installed on branch circuits. The original 7940100402 classification determines which substitute is appropriate for your application.

Q: Are both substitutes DIN Rail mountable?

A: Yes, both 2730570000 and 2730580000 support DIN Rail mounting, maintaining compatibility with standard industrial control panel installations.

Q: What certifications apply to each substitute?

A: 2730570000 holds CE, cULus, and VDE certifications with RoHS3 compliance. 2730580000 holds cULus certification. Verify that the required certifications for your jurisdiction and application are present before selection.

Q: Is the higher voltage rating (350V vs. 277V) a concern?

A: No. The 350V continuous operating voltage of both substitutes provides additional safety margin above the original 277V specification, maintaining protection effectiveness across the intended operating range.