CT-31 Equivalent & Substitute Parts Reference

Part Overview

The CT-31 is a 31-circuit barrier block connector manufactured by Curtis Industries, designed for chassis and panel mounting applications. This terminal block features a 0.546" (13.86mm) pitch with dual-wall barrier construction, rated for 30A at 600V, and accommodates wire gauges from 10-22 AWG. The CT-31 is classified as obsolete, making identification of functionally equivalent active alternatives essential for ongoing system maintenance and new design implementations.

Substiute Parts

CT-31

Curtis IndustriesIn Stock: 901CT-31 Datasheet

Current PartRFQ

CDM-31

Curtis IndustriesIn Stock: 860CDM-31 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The CDM-31 qualifies as a direct functional equivalent to the CT-31 based on the following critical parameters that determine substitutability:

• Circuit Configuration: Both parts provide 31 circuits with 62 wire entries
• Electrical Ratings: Identical 30A current rating and 600V voltage rating
• Physical Dimensions: Matching 0.546" (13.86mm) pitch and 2-row configuration
• Termination Method: Both utilize screw-based top termination with closed bottom termination
• Barrier Construction: Dual-wall (2 Wall) barrier type on both parts
• Wire Compatibility: Both accept 10-22 AWG wire gauges
• Mounting Interface: Both support chassis and panel mounting
• Environmental Specifications: Identical 130°C operating temperature and UL94 V-0 flammability rating
• Regulatory Compliance: Both are RoHS compliant and REACH unaffected

The primary distinction is product status: CT-31 is obsolete while CDM-31 is active, with CDM-31 offering continued availability and support.

Parameter Comparison

Engineering Selection Recommendations

The CDM-31 is the appropriate selection for applications currently using or specifying the CT-31. Both parts maintain identical electrical and mechanical specifications, ensuring direct functional compatibility. The CDM-31 offers the advantage of active product status with ongoing manufacturer support and availability. Both parts meet current regulatory requirements including RoHS compliance and REACH compliance status. The CDM-31 carries ROHS3 certification, reflecting current compliance standards. Selection of CDM-31 eliminates obsolescence risk while maintaining full electrical and mechanical compatibility with existing system designs.

Frequently Asked Questions (FAQ)

Q: Can CDM-31 directly replace CT-31 in existing applications? A: Yes. Both parts share identical electrical ratings (30A, 600V), circuit configuration (31 circuits), pitch (0.546"), wire gauge compatibility (10-22 AWG), termination method (screw-based), and mounting interfaces (chassis/panel). Physical and electrical substitution is direct.

Q: Are there any dimensional differences between CT-31 and CDM-31? A: No. Both parts maintain the same 0.546" (13.86mm) pitch, 2-row configuration, and mounting footprint. PCB and chassis mounting interfaces are identical.

Q: What is the significance of the product status difference? A: CT-31 is classified as obsolete, indicating discontinued manufacturing and limited availability. CDM-31 is active, ensuring continued supply, technical support, and compliance with current standards. For new designs or system maintenance, CDM-31 is the recommended selection.

Q: Do both parts meet current regulatory requirements? A: Yes. Both CT-31 and CDM-31 are RoHS compliant and REACH unaffected. CDM-31 carries ROHS3 certification, reflecting the most current compliance framework. Both maintain UL94 V-0 flammability ratings and identical environmental specifications.

Q: Are there packaging differences between these parts? A: CT-31 is listed with unspecified packaging, while CDM-31 is supplied in bulk packaging. This does not affect electrical or mechanical compatibility; packaging selection depends on procurement and inventory requirements.

Q: What wire gauges are compatible with both parts? A: Both CT-31 and CDM-31 accept wire gauges from 10-22 AWG, providing identical wire termination flexibility.

Q: Is the barrier construction identical on both parts? A: Yes. Both parts feature 2-wall (dual) barrier construction with flange and marking strip features, providing identical electrical isolation and circuit separation.