OSTVM085551 Terminal Block Plug - Equivalent & Substitute Parts

Part Overview

The OSTVM085551 is an 8-position terminal block plug manufactured by On Shore Technology Inc., featuring female sockets with 0.200" (5.08mm) pitch spacing and 180° free-hanging in-line mounting. This component is currently active in production and widely used in industrial control, automation, and power distribution applications requiring screw-pressure clip termination.

Substitute parts become necessary when the primary part reaches end-of-life status, experiences supply constraints, or when system redesigns require alternative mechanical configurations. The substitute identified for this product is the Weidmüller 1557910000, which shares core electrical and mechanical compatibility parameters while differing in specific design characteristics.

Substiute Parts

OSTVM085551

On Shore Technology Inc.In Stock: 917OSTVM085551 Datasheet

Current PartRFQ

1557910000

WeidmüllerIn Stock: 10771557910000 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the OSTVM085551 is determined by the following critical parameters that must remain constant or compatible:

• Position Count & Pitch: Both main and substitute parts must maintain 8 positions at 0.200" (5.08mm) spacing to ensure mechanical and electrical compatibility with mating connectors and PCB layouts.
• Connector Type: Both must be plug-type connectors with female sockets to maintain interface compatibility.
• Mounting Configuration: Free-hanging in-line mounting is required for both parts to fit within the same mechanical envelope.
• Voltage Rating: UL voltage rating of 300 V is the minimum acceptable standard for both parts.
• Flammability Compliance: UL94 V-0 rating is mandatory for both parts to meet safety standards.
• Screw Size: M2.5 fasteners must be consistent across both parts for proper termination.

The Weidmüller 1557910000 meets these core substitution criteria. However, differences exist in wire entry angle (270° versus 180°), termination mechanism (clamping yoke versus pressure clip), current ratings, and operating temperature ranges. These differences require engineering evaluation for specific applications.

Parameter Comparison

Engineering Selection Recommendations

The OSTVM085551 remains the preferred selection for new designs due to its active product status and higher current rating (20 A UL versus 10 A UL). The part is ROHS3 compliant and maintains full manufacturing support.

The Weidmüller 1557910000 is classified as obsolete and should be considered only when the OSTVM085551 becomes unavailable. Key considerations for substitution:

• Current Derating: The Weidmüller substitute carries a 50% lower UL current rating (10 A versus 20 A). Applications requiring the full 20 A capacity cannot use this substitute without circuit redesign.
• Wire Entry Angle: The 270° wire entry on the Weidmüller differs from the 180° entry on the On Shore part. Physical space constraints and cable routing must be evaluated for each application.
• Termination Mechanism: The clamping yoke design differs from the pressure clip design. Wire preparation and installation procedures will differ between parts.
• Temperature Range: The Weidmüller operates to -50°C (versus -30°C minimum), providing extended low-temperature capability, while the On Shore part extends to 105°C (versus 100°C maximum).
• Contact Material: Zinc plating on the On Shore part versus tin plating on the Weidmüller may affect corrosion resistance in specific environments.

Both parts maintain UL94 V-0 flammability compliance and identical M2.5 screw fastening, supporting basic mechanical interchangeability in the connector interface.

Frequently Asked Questions (FAQ)

Q: Can the Weidmüller 1557910000 directly replace the OSTVM085551 in existing installations?

A: Direct replacement is not recommended without application review. While both parts share 8-position, 5.08mm pitch configuration and free-hanging mounting, the Weidmüller carries half the current rating (10 A versus 20 A UL). If the circuit operates above 10 A, the substitute is not suitable. Additionally, the 270° wire entry angle differs from the 180° entry, requiring physical space verification.

Q: What are the critical parameters that must match for substitution?

A: The following parameters must remain identical or compatible: number of positions (8), pitch spacing (5.08mm), connector type (plug with female sockets), mounting style (free-hanging in-line), voltage rating (minimum 300 V UL), flammability rating (UL94 V-0), and screw size (M2.5).

Q: Why is the Weidmüller part listed as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production and support. This part should be used only when the active OSTVM085551 is unavailable. Inventory may still exist through authorized distributors, but long-term availability is not guaranteed.

Q: Does the wire gauge range difference affect compatibility?

A: The Weidmüller accepts 12-26 AWG (versus 12-22 AWG on the On Shore part), providing broader wire size compatibility. However, the termination mechanism differs (clamping yoke versus pressure clip), so wire preparation procedures must follow the specific manufacturer's guidelines for each part.

Q: Are there compliance differences between the two parts?

A: Both parts are UL94 V-0 rated and REACH unaffected. The OSTVM085551 is ROHS3 compliant, while the Weidmüller is RoHS compliant. For new designs subject to ROHS3 requirements, the On Shore part is the appropriate choice.