RI-48B Glass Body Reed Switch SPST-NO Equivalent & Substitute Parts

Part Overview

The RI-48B is a Glass Body Reed Switch manufactured by Comus International, configured as a Single Pole Single Throw Normally Open (SPST-NO) contact arrangement. This component is rated for 1A switching current at 250V AC (200V DC) with 70W power handling capability. The RI-48B is classified as an obsolete product status, making identification of active equivalent alternatives necessary for ongoing system support and new design implementations where through-hole mounting is preferred.

Substiute Parts

RI-48B

Comus InternationalIn Stock: 1234RI-48B Datasheet

Current PartRFQ

RI-48GP-3035

Comus InternationalIn Stock: 874RI-48GP-3035 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The RI-48GP-3035 qualifies as a functional equivalent substitute based on the following critical parameters that determine substitutability:

Matching Parameters (Electrical Equivalence):

• Circuit Configuration: SPST-NO (identical contact arrangement)
• Current - Switching: 1A (AC/DC) (identical current rating)
• Voltage - Switching AC: 250 V (identical AC voltage rating)
• Voltage - Switching DC: 200 V (identical DC voltage rating)
• Power - Rated: 70W (identical power handling)
• Operating Temperature Range: -55°C ~ 125°C (identical range)
• Capacitance: 0.2 pF (identical)
• Current - Carry: 2.25A (AC/DC) (identical carry capacity)

Differing Parameters (Functional Differences):

• Operate Range: RI-48B operates at 24 ~ 51AT; RI-48GP-3035 operates at 30 ~ 35AT
• Release Range: RI-48B releases at 13 ~ 27AT; RI-48GP-3035 releases at 23 ~ 31AT
• Mounting Type: RI-48B uses Through Hole; RI-48GP-3035 uses Surface Mount
• Product Status: RI-48B is Obsolete; RI-48GP-3035 is Active

The operate and release range differences represent distinct magnetic trip point specifications. The RI-48GP-3035 provides a narrower, more stable operate window suitable for controlled magnetic field applications, while the RI-48B accommodates broader field variation. Mounting type difference requires PCB design adaptation.

Parameter Comparison

Engineering Selection Recommendations

RI-48GP-3035 as Active Substitute:

The RI-48GP-3035 is the recommended active substitute for the obsolete RI-48B when replacement is required. Both components share identical electrical switching characteristics (1A at 250V AC / 200V DC, 70W power rating) and are RoHS compliant with REACH unaffected designation. The RI-48GP-3035 maintains active product status with ongoing manufacturer support and availability, contrasting with the RI-48B's obsolete classification.

Magnetic Trip Point Differences:

The operate range narrowing from 24 ~ 51AT to 30 ~ 35AT on the RI-48GP-3035 indicates application-specific magnetic field tuning. Selection between these variants depends on the magnetic field strength of the actuating environment. The RI-48B accommodates broader field variation, while the RI-48GP-3035 provides consistent operation within its tighter specification window.

Mounting Consideration:

The transition from through-hole (RI-48B) to surface-mount (RI-48GP-3035) requires PCB redesign. This change aligns with modern assembly practices and reduces overall component footprint, though it necessitates modification of existing through-hole layouts.

Frequently Asked Questions (FAQ)

Q: Can RI-48GP-3035 directly replace RI-48B in existing designs?

A: Electrical and switching characteristics are identical (1A, 250V AC, 200V DC, 70W). However, the RI-48GP-3035 uses surface-mount packaging versus through-hole, requiring PCB layout modification. The operate range difference (30 ~ 35AT vs 24 ~ 51AT) must be verified against your magnetic field environment.

Q: What is the significance of the operate range difference?

A: Operate range specifies the magnetic field strength (in Ampere-Turns) required to close the reed switch contacts. The RI-48B tolerates field variation from 24 to 51AT, while the RI-48GP-3035 operates within a narrower 30 ~ 35AT window. Applications with stable, predictable magnetic fields benefit from the tighter specification.

Q: Are both components RoHS compliant?

A: Yes. The RI-48B is RoHS Compliant. The RI-48GP-3035 is ROHS3 Compliant. Both meet current regulatory requirements, with the substitute offering enhanced compliance certification.

Q: What is the availability difference between these parts?

A: The RI-48B is classified as obsolete with 1130 pieces in stock. The RI-48GP-3035 is an active product with 769 pieces in stock, ensuring long-term availability and manufacturer support.

Q: How does the Current - Carry specification differ between parts?

A: The RI-48B specifies 2.25A (AC/DC) carry current, while the RI-48GP-3035 specifies 2.25A (DC) only. Both handle identical DC carry current; the RI-48B accommodates AC carry current at the same rating.