APEM 645H/2 Toggle Switch DPDT Equivalent & Substitute Parts

Part Overview

The APEM 645H/2 is a panel-mounted toggle switch with DPDT (Double Pole Double Throw) circuit configuration, rated for 10A AC at 250V. This component is classified as Active product status and is RoHS3 compliant. Substitute parts may be required due to inventory constraints, application-specific voltage or current requirements, or regional component availability.

Substiute Parts

645H/2

APEM Inc.In Stock: 1109645H/2 Datasheet

Current PartRFQ

S335F

NKK SwitchesIn Stock: 1245S335F Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The NKK Switches S335F qualifies as a functional substitute based on the following alignment criteria:

Matching Parameters:

• Circuit configuration: DPDT
• Switch function: On-Mom
• Mounting type: Panel Mount
• Actuator type: Standard Round
• Actuator length: 17.50mm
• Termination style: Quick Connect - 0.250" (6.3mm)
• RoHS3 compliance
• Active product status

Differing Parameters:

• Current rating: S335F rated 15A AC (vs. 645H/2 at 10A AC)
• Voltage rating: S335F rated 125V AC (vs. 645H/2 at 250V AC)
• Panel cutout diameter: S335F 12.50mm (vs. 645H/2 at 12.20mm)
• Bushing thread: S335F M12 x 1 (vs. 645H/2 M12 x 0.75)
• Operating temperature: S335F -10°C to 70°C (vs. 645H/2 -20°C to 55°C)
• Electrical life: S335F 25,000 cycles (vs. 645H/2 10,000 cycles)

Parameter Comparison

Engineering Selection Recommendations

Both the APEM 645H/2 and NKK Switches S335F maintain Active product status and RoHS3 compliance. Selection between these components depends on application voltage and current requirements:

The APEM 645H/2 is suitable for applications requiring 250V AC operation. The NKK Switches S335F is suitable for applications requiring 125V AC operation with higher current capacity (15A AC). The S335F provides extended electrical life (25,000 cycles vs. 10,000 cycles) and wider operating temperature range (-10°C to 70°C vs. -20°C to 55°C).

Panel cutout and bushing thread specifications differ between components and must be evaluated against mechanical installation constraints.

Frequently Asked Questions (FAQ)

Q: Can the NKK Switches S335F replace the APEM 645H/2 in all applications?

A: Substitution is application-dependent. Both components share identical circuit configuration (DPDT), switch function (On-Mom), actuator geometry (17.50mm standard round), and termination style (Quick Connect 0.250"). However, voltage ratings differ: the 645H/2 operates at 250V AC while the S335F operates at 125V AC. The S335F cannot be used in 250V AC applications. Panel cutout diameter and bushing thread specifications also differ and must be evaluated against mechanical installation requirements.

Q: What are the key compatibility criteria for these toggle switches?

A: Core compatibility criteria include circuit configuration (DPDT), switch function (On-Mom), mounting type (Panel Mount), actuator type and length (Standard Round, 17.50mm), and termination style (Quick Connect 0.250"). Voltage rating, current rating, panel cutout diameter, and bushing thread are application-specific parameters that must match installation requirements.

Q: How do electrical life ratings affect component selection?

A: The NKK Switches S335F provides 25,000 electrical cycles compared to 10,000 cycles for the APEM 645H/2. Higher electrical life ratings indicate extended operational durability under repeated switching conditions. Selection should align with application duty cycle requirements.

Q: Are there mechanical installation differences between these components?

A: Yes. Panel cutout diameter differs: 645H/2 requires 12.20mm circular cutout while S335F requires 12.50mm. Bushing thread specifications also differ: 645H/2 uses M12 x 0.75 while S335F uses M12 x 1. These mechanical parameters must be verified against panel design specifications before substitution.

Q: Do both components meet the same compliance standards?

A: Yes. Both the APEM 645H/2 and NKK Switches S335F are RoHS3 compliant and maintain Active product status, ensuring equivalent regulatory compliance for applications subject to these requirements.