ALZ51B09 General Purpose Relay SPST 16A 9VDC Equivalent & Substitute Parts

Part Overview

The ALZ51B09 is a general purpose relay manufactured by Panasonic Electric Works, configured as a single-pole single-throw normally open (SPST-NO) contact form with a 9VDC coil. This through-hole mounted relay is rated for 16A switching capacity at 440VAC maximum and is currently in active product status. The ALZ51B09 remains widely available with 1070 pieces in current inventory. Equivalent and substitute parts are identified when identical electrical specifications and mechanical compatibility are maintained across the SPST-NO 9VDC relay category, allowing for component interchangeability in applications where coil voltage, contact rating, and termination style are critical design parameters.

Substiute Parts

ALZ51B09

Panasonic Electric WorksIn Stock: 1166ALZ51B09 Datasheet

Current PartRFQ

1-1415540-6

TE Connectivity Potter & Brumfield RelaysIn Stock: 12271-1415540-6 Datasheet

SimilarRFQ

RZ03-1A4-D009

TE Connectivity Potter & Brumfield RelaysIn Stock: 2193RZ03-1A4-D009 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ALZ51B09 are qualified based on strict electrical and mechanical parameter alignment within the general purpose relay category. The primary substitution criteria are:

Critical Parameters for Substitution:

• Coil Voltage: 9VDC (exact match required)
• Contact Form: SPST-NO (1 Form A) (exact match required)
• Contact Rating: 16 A (exact match required)
• Mounting Type: Through Hole (exact match required)
• Termination Style: PC Pin (exact match required)
• Coil Resistance: 200-203 Ohms (acceptable tolerance range)

Secondary Compatibility Parameters:

• Switching Voltage: 400VAC minimum acceptable (ALZ51B09 operates at 440VAC maximum)
• Operating Temperature: -40°C minimum and 85°C minimum upper limit
• Coil Type: Non Latching (required for general purpose relay function)
• RoHS Compliance: ROHS3 Compliant (environmental and regulatory requirement)

The identified substitute parts maintain these critical parameters while allowing for minor variations in contact material composition, coil insulation class, and switching speed characteristics that do not affect functional interchangeability in standard general purpose relay applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: RZ03-1A4-D009 (TE Connectivity Potter & Brumfield Relays)

The RZ03-1A4-D009 is the recommended substitute for the ALZ51B09. Both parts maintain active product status, ensuring long-term availability and supply chain stability. The RZ03-1A4-D009 meets all critical electrical parameters: 9VDC coil voltage, SPST-NO contact form, 16A contact rating, and PC pin termination. Coil resistance tolerance (200 Ohms versus 203 Ohms) falls within acceptable engineering margins. The RZ03-1A4-D009 operates across the same temperature range (-40°C to 85°C) and carries ROHS3 compliance with unlimited moisture sensitivity rating. Switching voltage is rated at 400VAC maximum, which is acceptable for applications operating below 440VAC. The substitute exhibits faster switching characteristics (8 ms operate time versus 15 ms), which represents an operational improvement in most general purpose relay applications.

Secondary Substitute: 1-1415540-6 (TE Connectivity Potter & Brumfield Relays)

The 1-1415540-6 meets all critical electrical substitution parameters with identical coil voltage, contact form, current rating, and coil resistance. However, this part carries obsolete product status, indicating discontinued manufacturing and limited future availability. The extended operating temperature range (-40°C to 105°C) provides thermal margin beyond the ALZ51B09 specification. Switching voltage is rated at 400VAC maximum. This substitute should be considered only when supply of the primary substitute is unavailable and when the application does not require long-term component availability assurance.

Frequently Asked Questions (FAQ)

Q: Can the RZ03-1A4-D009 directly replace the ALZ51B09 in existing circuit designs?

A: Yes. Both relays share identical coil voltage (9VDC), contact form (SPST-NO), current rating (16A), and PC pin termination. The RZ03-1A4-D009 operates within the same temperature range and meets equivalent regulatory compliance. The 3-ohm coil resistance difference (200 versus 203 ohms) is within standard engineering tolerance and does not affect circuit operation. Faster switching speed (8 ms versus 15 ms) represents an operational improvement.

Q: What is the significance of the 400VAC versus 440VAC switching voltage difference?

A: The ALZ51B09 is rated for 440VAC maximum switching voltage, while both substitute parts are rated at 400VAC maximum. This means substitute parts are suitable for applications switching loads at 400VAC or below. Applications requiring 440VAC switching capability should retain the ALZ51B09 or confirm that actual operating voltage does not exceed 400VAC.

Q: Why is the 1-1415540-6 listed as obsolete?

A: Obsolete product status indicates the manufacturer has discontinued production. While inventory may remain available from distributors, long-term supply cannot be assured. For new designs or applications requiring extended component availability, the RZ03-1A4-D009 (active status) is the preferred substitute.

Q: Are there differences in contact material between these relays?

A: Yes. The ALZ51B09 uses Silver Tin Oxide (AgSnO) contact material, while both TE Connectivity substitutes use Silver Nickel (AgNi). Both materials are standard for general purpose relays and provide equivalent performance in standard switching applications. Contact material selection does not affect functional interchangeability for general purpose relay duty.

Q: What does coil insulation class mean, and does the difference between Class B and Class F matter?

A: Coil insulation class defines the maximum safe operating temperature for the insulation material. Class B is rated to 130°C, while Class F is rated to 155°C. Since both the ALZ51B09 and substitutes operate within -40°C to 85°C (or 105°C for the 1-1415540-6), the higher insulation class of the substitutes provides additional thermal margin but does not affect performance in the specified operating range.

Q: Are all three relays RoHS3 compliant?

A: Yes. The ALZ51B09, 1-1415540-6, and RZ03-1A4-D009 are all ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components.

Q: What is the difference in switching speed, and does it matter?

A: The ALZ51B09 has an operate time of 15 ms and release time of 5 ms. Both TE Connectivity substitutes have operate time of 8 ms and release time of 6 ms. Faster switching speed generally improves application response time and is not detrimental. Applications with specific timing requirements should confirm that faster switching does not create unintended circuit behavior.