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Carbon Brushes

CG657 Metal Graphite Carbon Brush

Part No. CG657

CG657 metal-graphite (copper graphite) carbon brush for slip-ring (wound-rotor) motors and Siemens mill-motor slip-ring systems. Resistivity 140 µΩ·cm, rated 12–14 A/cm², max surface speed 25 m/s; supplied to size per drawing with copper-braid lead.

Material	Metal graphite (copper graphite)
Dimensions	- Standard size: 20 × 40 × 50 mm (per Aobo/Made-in-China listing) - Siemens mill-motor slip-ring siz
Application	CG657 metal-graphite brush for: - Slip-ring (wound-rotor) motors and generators — collector-ring brush positions - Siemens mill motor slip-ring systems — roller mill / grinding mill motors (Aobo supply for Siemens mill motors) - **High-load, low-
Current Density	12–14 A/cm²
Speed	Maximum normal surface speed 25 m/s

Compatible Models

- CG657 (copper graphite) — grade per Aobo parameter table - CG family cross-references: CG651 CG626 CG665 CG75 (verify application fit) - Related metal-graphite family: OMC MC79P MC12

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Technical Specifications

Specification	Value
Grade	CG657 (copper graphite)
Material	Metal graphite (copper graphite)
Resistivity	140 µΩ·cm (per Aobo CG657 parameter table)
Hardness	Shore 26 (per Aobo CG657 parameter table)
Flexural Strength	33 MPa (per Aobo CG657 parameter table)
Density	3.0 g/cm³ (per Aobo CG657 parameter table)
Contact Drop / Friction	Grade codes TB / B per supplier table (numeric values not published)
Current Density	12-14 A/cm² (per Aobo CG657 parameter table)
Max Surface Speed	25 m/s (per Aobo CG657 parameter table)
Standard Size	20 x 40 x 50 mm (per Aobo listing)
Siemens Mill-Motor Size	20 x 32 x 40 mm (per Aobo listing)
Voltage	Not rated (N/A)
Lead Type	Flexible copper braid with terminal (per drawing)
Spring	Not included (brush-holder supplied)
Family Cross-References	CG651, CG626, CG665, CG75; related OMC, MC79P, MC12, CZ01
Application	Slip-ring (wound-rotor) motors & generators; Siemens mill-motor slip rings; high-load low-voltage motors; industrial motors/generators

Compatible Models

This CG657 Metal Graphite Carbon Brush is designed as a direct replacement for the following machine models and series:

- CG657 (copper graphite) — grade per Aobo parameter table - CG family cross-references: CG651 CG626 CG665 CG75 (verify application fit) - Related metal-graphite family: OMC MC79P MC12 CZ01 - Siemens mill motors — slip-ring brush positions (20 × 32 × 40 mm class) — verify per machine - Wound-rotor (slip-ring) motors and generators per Mersen CG-family application (verify per machine) - High-load low-voltage DC/AC machines requiring metal-graphite brushes (verify per machine)

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Description

This CG657 carbon brush is a copper-graphite metal-graphite brush from the Carbone/Mersen CG family, used mainly for slip-ring (collector-ring) positions on wound-rotor AC motors and generators — including Siemens mill-motor slip-ring systems (roller/grinding mill motors) — as well as high-load, low-voltage motors with light commutation duty. The metal-graphite material delivers low resistivity (140 µΩ·cm), a rated current density of 12–14 A/cm² and a maximum normal surface speed of 25 m/s per the Aobo parameter table, giving a stable, low-drop current transfer on slip rings. The brush is manufactured to your required size (standard 20 × 40 × 50 mm; Siemens mill-motor class 20 × 32 × 40 mm; custom per drawing), with flexible copper-braid lead and terminal, ready for installation in the corresponding brush holder.

Features & benefits:

CG657 copper-graphite metal graphite — low resistivity (140 µΩ·cm), stable slip-ring contact
Slip-ring proven — wound-rotor motors and generators; Siemens mill-motor slip-ring systems
High-load, low-voltage duty — metal-graphite material class
Rated 12–14 A/cm², max surface speed 25 m/s (per Aobo parameter table)
Custom to your drawing — sizes, lead length and terminal per specification
Flexible copper shunt — reliable, balanced current transfer
Quality-inspected before dispatch: dimensional check, lead crimp integrity, and surface condition per batch