Weidmüller 991998 General Purpose Relay SPDT 16A 120V - Equivalent & Substitute Parts

Part Overview

The Weidmüller 991998 is a general purpose relay with SPDT (Single Pole Double Throw) contact configuration, rated for 16A at 120VAC coil voltage. This relay is designed for DIN rail mounting with screw terminal connections and includes a socket for modular installation. The product is currently obsolete, making identification of compatible substitute parts essential for system maintenance, repair, and new installations where equivalent functionality is required.

Substiute Parts

991998

WeidmüllerIn Stock: 801991998 Datasheet

Current PartRFQ

RV8H-1L1-AD110

IDECIn Stock: 917RV8H-1L1-AD110 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Weidmüller 991998 is determined by the following critical parameters:

• Contact Configuration: SPDT (1 Form C) - electrical switching topology must remain identical
• Contact Rating: 16A minimum current capacity required for load compatibility
• Coil Voltage: 120VAC primary specification; 120VAC/DC compatibility acceptable for broader application support
• Switching Voltage: 240VAC maximum or higher ensures safe operation across intended voltage domains
• Mounting Type: DIN rail mounting required for panel integration
• Termination: Screw terminal connections for direct wiring compatibility
• Coil Type: Non-latching operation for standard relay control logic
• Socket Inclusion: Socket feature enables modular replacement without rewiring

The IDEC RV8H-1L1-AD110 meets all substitution criteria through equivalent electrical ratings, compatible mechanical form factor, and active product status with current availability.

Parameter Comparison

Engineering Selection Recommendations

The IDEC RV8H-1L1-AD110 is the qualified substitute for the obsolete Weidmüller 991998 based on the following engineering criteria:

Electrical Equivalence: Both relays maintain identical SPDT contact configuration and 16A current rating. The IDEC unit's 120VAC/DC coil voltage provides broader operational flexibility compared to the 120VAC-only specification of the Weidmüller unit. Switching voltage ratings (240VAC max vs. 250VAC nominal) are functionally equivalent for standard industrial applications.

Mechanical Compatibility: DIN rail mounting and screw terminal termination are identical, enabling direct panel integration without mechanical redesign. Socket inclusion on both units supports modular replacement strategies.

Regulatory and Compliance Status: Both parts carry identical REACH and ECCN classifications (REACH Unaffected, EAR99), ensuring no additional compliance documentation is required for substitution. The IDEC unit holds CE and cULus approvals, providing third-party validation for safety-critical applications.

Product Availability: The IDEC RV8H-1L1-AD110 maintains active product status with current inventory availability (895 pcs), eliminating supply chain risk associated with the obsolete Weidmüller part.

Operating Environment: The IDEC unit's extended operating temperature range (-40°C ~ 55°C) encompasses the Weidmüller specification (0°C ~ 60°C) with additional low-temperature capability, providing superior performance in diverse environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can the IDEC RV8H-1L1-AD110 directly replace the Weidmüller 991998 without circuit modifications?

A: Yes. Both relays share identical SPDT contact configuration, 16A current rating, DIN rail mounting, and screw terminal termination. The IDEC unit's 120VAC/DC coil voltage is compatible with 120VAC control circuits. No circuit redesign is required.

Q: What is the difference between 120VAC and 120VAC/DC coil voltage?

A: The Weidmüller unit operates exclusively on 120VAC coil supply. The IDEC unit accepts both 120VAC and 120VDC coil supply, providing operational flexibility in systems with either AC or DC control voltage. For 120VAC-only applications, both units function identically.

Q: Are the switching voltage ratings compatible?

A: Yes. The Weidmüller unit is rated for 240VAC maximum switching voltage, while the IDEC unit is rated for 250VAC nominal. Both specifications are suitable for standard industrial load switching applications. The IDEC unit provides marginally higher voltage capability.

Q: Does the socket feature differ between the two relays?

A: No. Both relays include socket features for modular installation. The socket design enables relay replacement without disturbing terminal connections, supporting rapid maintenance procedures.

Q: What is the impact of the extended operating temperature range on the IDEC substitute?

A: The IDEC RV8H-1L1-AD110 operates from -40°C to 55°C, compared to the Weidmüller unit's 0°C to 60°C range. The IDEC unit provides superior low-temperature performance, making it suitable for applications in cold environments. The upper temperature limit is slightly lower but remains adequate for most industrial control applications.

Q: Are there any compliance or certification differences?

A: Both units carry identical REACH and ECCN classifications. The IDEC unit includes CE and cULus certifications, providing additional third-party safety validation. No additional compliance documentation is required for substitution.

Q: What is the coil current specification for the IDEC substitute?

A: The IDEC RV8H-1L1-AD110 draws 5.8 mA coil current with a coil resistance of 21.5 kOhms. This specification is not provided for the Weidmüller unit but is typical for general purpose relays in this class and does not affect substitution compatibility.