TE Connectivity 1546977-4 Equivalent & Substitute Parts

Part Overview

The TE Connectivity AMP Connectors 1546977-4 is a 4-circuit barrier block connector with 0.438" (11.12mm) pitch, rated for 20A at 600V, and designed for chassis and panel mounting applications. This component features dual-wall barrier construction, screw termination on top, and quick connect insulated termination on the bottom. The part is classified as obsolete, necessitating identification of active equivalent and substitute barrier block connectors from current manufacturers to maintain design continuity and ensure supply chain availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	1546977-4
Manufacturer	TE Connectivity AMP Connectors
Category	Terminal Blocks
Terminal Block Type	Barrier Block
Number of Circuits	4
Pitch	0.438" (11.12mm)
Current Rating	20A
Voltage Rating	600V
Wire Gauge	12-22 AWG
Top Termination	Screws
Barrier Type	2 Wall (Dual)
Operating Temperature Range	-60°C ~ 105°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TE Connectivity 1546977-4 is determined by the following critical parameters that must be maintained or exceeded:

Mandatory Matching Parameters:

Number of Circuits: 4
Pitch: 0.437" to 0.438" (11.10mm to 11.12mm) — functionally equivalent spacing
Voltage Rating: 600V minimum
Wire Gauge Compatibility: 12-22 AWG
Barrier Type: 2 Wall (Dual)
Terminal Block Type: Barrier Block
Color: Black
Mounting Type: Chassis and/or Panel

Allowable Variations:

Current Rating: 20A minimum (substitute parts rated 30A are acceptable as higher-rated alternatives)
Top Termination: Screw variants including captive plate designs
Bottom Termination: Quick Connect, Solder Turret, PC Pin, or Insulated variants
Terminal Screw Material: Steel, Brass, or Stainless Steel
Operating Temperature: -40°C to -60°C minimum acceptable
Product Status: Active preferred over obsolete
Compliance: ROHS3 compliance preferred for new designs

The substitute parts listed below are grouped by bottom termination type and mounting configuration, as these characteristics define the specific application context while maintaining electrical and mechanical compatibility with the original 1546977-4 specification.

Parameter Comparison

Parameter	1546977-4 (Main)	A30110404	A30110407	A30130403	A30130407	A302104	A305304	A30530400	A30530404	A305404RC	A30710407
Manufacturer	TE Connectivity	Eaton	Eaton	Eaton	Eaton	Eaton	Eaton	Eaton	Eaton	Eaton	Eaton
Number of Circuits	4	4	4	4	4	4	4	4	4	4	4
Pitch	0.438" (11.12mm)	0.437" (11.10mm)	0.437" (11.10mm)	0.437" (11.10mm)	0.437" (11.10mm)	0.437" (11.10mm)	0.437" (11.10mm)	0.437" (11.10mm)	0.437" (11.10mm)	0.437" (11.10mm)	0.437" (11.10mm)
Number of Rows	1	1	1	1	1	1	1	1	1	1	1
Current Rating (Amps)	20A	30A	30A	30A	30A	30A	30A	30A	30A	30A	30A
Voltage Rating	600V	600V	600V	600V	600V	600V	600V	600V	600V	600V	600V
Wire Gauge	12-22 AWG	12-22 AWG	12-22 AWG	12-22 AWG	12-22 AWG	12-22 AWG	12-22 AWG	12-22 AWG	12-22 AWG	12-22 AWG	12-22 AWG
Top Termination	Screws	Screws	Screws with Captive Plate	Screws	Screws with Captive Plate	Screws	Screws	Screws	Screws	Screws	Screws with Captive Plate
Bottom Termination	Quick Connect (0.250"), Insulated	Solder Turret	Solder Turret	Solder Turret, Insulated	Solder Turret, Insulated	PC Pin	Solder Turret, Insulated	Solder Turret, Insulated	Solder Turret, Insulated	Solder Turret, Insulated	PC Pin
Barrier Type	2 Wall (Dual)	2 Wall (Dual)	2 Wall (Dual)	2 Wall (Dual)	2 Wall (Dual)	2 Wall (Dual)	2 Wall (Dual)	2 Wall (Dual)	2 Wall (Dual)	2 Wall (Dual)	2 Wall (Dual)
Features	Flange	Flange	Flange	Flange	Flange	Flange	Flange	Flange	Flange	Retaining Clips	Flange
Color	Black	Black	Black	Black	Black	Black	Black	Black	Black	Black	Black
Terminal Screw Material	Steel	Brass	Steel	Steel, Stainless	Steel	Steel	Steel	Steel	Brass	Steel	Steel
Mounting Type	Chassis, Panel	Chassis, Panel	Chassis, Panel	Chassis, Panel	Chassis, Panel	Through Hole	Chassis, Panel	Chassis, Panel	Chassis, Panel	Chassis, Panel	Through Hole
Operating Temperature	-60°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Material - Insulation	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic	Thermoplastic
Material Flammability Rating	UL94 V-2	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0	UL94 V-0
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not applicable	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed Eaton A3000 series barrier block connectors are active products with ROHS3 compliance, providing superior regulatory status compared to the obsolete TE Connectivity 1546977-4. Selection among substitute parts should be based on the specific termination and mounting requirements of the target application:

For Solder Turret Termination (Chassis/Panel Mount):

A30110404: Standard configuration with brass screw material and nickel finish
A30130403: Insulated solder turret with stainless steel screw option
A305304: Insulated solder turret with zinc-plated steel screws
A30530400: Insulated solder turret with zinc-plated steel screws
A30530404: Insulated solder turret with brass screw material and nickel finish

For Solder Turret Termination with Captive Plate (Chassis/Panel Mount):

A30110407: Standard configuration with zinc-plated steel screws
A30130407: Insulated solder turret with zinc-plated steel screws

For Solder Turret Termination with Retaining Clips (Chassis/Panel Mount):

A305404RC: Insulated solder turret with zinc-plated steel screws and retaining clip feature

For PC Pin Termination (Through Hole Mount):

A302104: Standard configuration with zinc-plated steel screws
A30710407: Captive plate configuration with zinc-plated steel screws

All substitute parts exceed the original 20A current rating at 30A, provide enhanced flammability rating (UL94 V-0 versus V-2), and maintain 600V voltage rating and 12-22 AWG wire gauge compatibility. The 0.437" pitch of substitute parts is functionally equivalent to the original 0.438" specification within standard tolerance ranges for barrier block connectors.

Frequently Asked Questions (FAQ)

Q: Can Eaton A3000 series barrier blocks directly replace the TE Connectivity 1546977-4?

A: Direct mechanical and electrical replacement is possible when bottom termination type matches the application requirements. The 0.437" pitch of Eaton parts is functionally equivalent to the 0.438" original specification. However, the original part features quick connect termination on the bottom, which is not available in the Eaton substitute lineup. Applications using the quick connect feature require redesign to accommodate alternative termination methods (solder turret, PC pin, or insulated variants).

Q: What is the pitch difference between 0.438" and 0.437", and does it affect compatibility?

A: The 0.02mm difference (0.001") is within standard manufacturing tolerances for barrier block connectors and does not affect functional compatibility. Both pitches accommodate the same 4-circuit configuration and wire gauge range (12-22 AWG).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed Eaton A3000 series substitute parts carry ROHS3 compliance certification, whereas the original TE Connectivity 1546977-4 has "Not applicable" RoHS status due to its obsolete classification. This compliance upgrade is beneficial for new designs and applications subject to environmental regulations.

Q: What is the difference between insulated and non-insulated solder turret terminations?

A: Insulated solder turret terminations (A30130403, A30130407, A305304, A30530400, A30530404, A305404RC) provide electrical isolation at the bottom connection point, suitable for PCB applications requiring isolation between the terminal block and circuit board traces. Non-insulated solder turret terminations (A30110404, A30110407) provide direct electrical connection and are used in applications where the solder turret connects directly to conductive PCB pads.

Q: What mounting type should I select for my application?

A: Chassis and Panel mount types (A30110404, A30110407, A30130403, A30130407, A305304, A30530400, A30530404, A305404RC) are suitable for external mounting on enclosures or control panels. Through Hole mount types (A302104, A30710407) are designed for PCB insertion and are used in applications where the terminal block is mounted directly to a printed circuit board.

Q: Does the captive plate feature affect electrical performance?

A: No. The captive plate feature (A30110407, A30130407, A30710407) provides mechanical retention of the screw during assembly and does not alter electrical characteristics. Selection between standard and captive plate designs is based on assembly process requirements and operator preference.

Q: What is the difference between steel, brass, and stainless steel terminal screw materials?

A: Terminal screw material selection affects corrosion resistance and cost. Steel with zinc or nickel plating (A30110404, A30110407, A30130403, A30130407, A302104, A305304, A30530400, A305404RC, A30710407) provides standard corrosion protection for general industrial applications. Brass with nickel finish (A30110404, A30530404) offers enhanced corrosion resistance for harsh environments. Stainless steel (A30130403) provides maximum corrosion resistance for marine or chemical exposure applications.

Q: Can I use a 30A-rated substitute part in a 20A application?

A: Yes. All substitute parts are rated for 30A, which exceeds the original 20A requirement. Higher current ratings provide design margin and do not negatively impact performance in lower-current applications.

Q: What is the operating temperature difference between the original part and substitutes?

A: The original TE Connectivity 1546977-4 operates from -60°C to 105°C, while all Eaton substitutes operate from -40°C to 105°C. The 20°C difference at the lower temperature limit may be significant for applications requiring operation below -40°C. For such applications, the original part specification must be maintained or alternative components evaluated.

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