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Full Range of Marine Classification Society Certifications: Approved by major global marine classification societies, complying with regulatory requirements for various vessels and offshore engineering equipment.
Wide Operating Temperature Range: -30°C to +60°C, suitable for extreme temperature variations in marine environments.
- Model Code Explanation
| Segment | Code | Description |
| Product Range | C60 | Miniature Circuit Breaker of Multi9 series |
| Breaking Capacity | N | Standard breaking capacity (10kA, 400V AC) |
| Number of Poles | 2P | 2 poles (2 protected poles) |
| Rated Current | 20A | Rated operational current: 20 Amperes |
| Trip Curve | C | C-curve (Trips at 8~12 times rated current, for combined lighting and motor loads) |
| Order Number | 24338 | Original standard order number of Schneider (equivalent to M9F11220) |
Full Model: C60N 2P C20A (Official Standard Model)
Order Number: 24338 (M9F11220)
- Main Technical Specifications
| Parameter Category | Detailed Specifications |
| Basic Parameters | 2-pole miniature circuit breaker, C-type trip curve, rated current 20A |
| Rated Voltage | AC: 400V (50/60Hz); DC: 125V |
| Breaking Capacity | 10kA @ 400V AC (compliant with IEC 60947-2) |
| Trip Characteristic | C-curve: 8.2In ±20% (In=20A, tripping range: 164~200A) |
| Mechanical Endurance | 20,000 operating cycles |
| Electrical Endurance | 10,000 operating cycles at rated current |
| Ambient Conditions | Temperature: -30°C ~ +60°C; Humidity: ≤95% (non-condensing) |
| Mounting | 35mm DIN rail mounting (compliant with EN 60715) |
| Dimensions & Weight | Height: 85mm; Width: 45mm; Depth: 60mm; Weight: approx. 180g |
| Protection Degree | IP20 (compliant with IEC 60529) |
| Marine Certifications | Certified by 9 major classification societies including ABS, BV, DNV, GL, LRS, RINA, CCS, KRS |
| Standard Approvals | IEC 60947-2, GB 14048.2, CE, CCC, etc. |
- Marine Features & Application Scenarios
3.1 Core Advantages for Marine Use
Full Marine Classification Certifications: Complies with standards of mainstream global marine classification societies for vessels and offshore facilities.
Wide Temperature Adaptation: Operates stably from -30°C to +60°C to cope with harsh marine temperature conditions.
Vibration & Shock Resistance: Compliant with IEC 60068-2-6 (Vibration) and IEC 60068-2-27 (Shock), applicable to rough working conditions during vessel navigation.
Corrosion Resistance: Special salt-fog resistant housing material extends service life in marine environments.
3.2 Applicable Scenarios
Ship Power Systems: Protection for main switchboards, emergency switchboards, lighting and ventilation systems.
Offshore Platforms: Power distribution and protection for drilling platforms, offshore wind farms, FPSO and other facilities.
Marine Auxiliary Equipment: Control circuit protection for pumps, compressors, fans, navigation equipment, etc.
Yachts & Small Vessels: Meets safety standards for recreational marine craft.
3.3 Non-recommended Scenarios
High Short-circuit Current Environment: Locations with short-circuit current exceeding 10kA (C60H series with 15kA breaking capacity is recommended).
High-voltage DC Systems: DC circuits over 125V (special DC circuit breakers required).
Frequent Cycling Circuits: Operations over 10 cycles per minute (use contactors with protective devices instead).
- Replacement & Upgrade Solutions
4.1 Original Schneider Replacements
| Original Model | Replacement Model | Reason for Replacement | Compatibility |
| 24338 (C60N 2P C20A) | A9F44220 (iC60N 2P C20A) | Upgraded Acti9 series, breaking capacity increased to 15kA | Identical mounting dimensions, direct replacement |
| 24338 (C60N 2P C20A) | M9F11220 (C60N 2P C20A) | Official original model, fully identical to 24338 | 100% compatible |
| 24338 (C60N 2P C20A) | C60H 2P C20A | Breaking capacity upgraded to 15kA for severe working conditions | Identical mounting dimensions, enhanced breaking performance |
4.2 Cross-brand Replacements
| Brand | Replacement Model | Main Differences | Applicability |
| ABB | S202-C20 | 10kA breaking capacity, C-curve, 2P 20A | Same mounting size, direct replacement |
| Siemens | 5SY6220-7CC | 10kA breaking capacity, C-curve, 2P 20A | Slight difference in auxiliary functions, consistent basic protection |
| Chint | DZ47-63 2P C20 | Domestic alternative with cost advantage, 6kA breaking capacity | For non-critical marine equipment |
- Troubleshooting & Maintenance Guidelines
5.1 Common Fault Diagnosis
| Fault Phenomenon | Possible Causes | Solutions |
| Frequent tripping | 1. Overloaded load; 2. Circuit short circuit; 3. Mismatched trip curve | 1. Check if load current exceeds rated value; 2. Inspect circuit insulation; 3. Verify suitability of C-curve for the load |
| Failure to trip | 1. Damaged tripping mechanism; 2. Current below trip threshold; 3. Incorrect wiring | 1. Inspect mechanical condition of tripping mechanism; 2. Measure actual operating current; 3. Confirm correct wiring (line in, load out) |
| Severe overheating | 1. Loose terminals; 2. Oxidized contacts; 3. Excess ambient temperature | 1. Retighten wiring terminals; 2. Clean contacts; 3. Improve ventilation and heat dissipation |
| Mechanical jamming | 1. Foreign object ingress; 2. Worn operating mechanism; 3. Loose parts caused by vibration | 1. Power off and remove foreign objects; 2. Inspect operating mechanism; 3. Reinforce mounting fixtures |
5.2 Maintenance Recommendations for Marine Environments
| Maintenance Item | Cycle | Operation |
| Visual Inspection | Monthly | Check for salt-fog corrosion, cracks and loose components |
| Insulation Resistance Test | Quarterly | Use megohmmeter to test insulation resistance (value shall be higher than 1MΩ) |
| Contact Inspection | Semi-annually | Check contacts for ablation and oxidation; measure contact resistance |
| Function Test | Annually | Simulate overload and short circuit to verify normal tripping performance |
| Cleaning | Annually | Remove internal dust with dry compressed air; avoid chemical detergents |
- Selection Guide & Air Freight Compliance
Mnemonic for Selection
C60N two-pole, twenty ampere C-curve,
Nine marine approvals, ten kiloamp breaking,
Replace with iC60 for higher capacity,
Safe for marine use, DIN rail mount ready.
Air Freight Compliance
Transport Classification: Non-dangerous goods. No built-in lithium batteries or supercapacitors, compliant with IATA regulations.
Packaging Requirement: Individual packaging to prevent damage from vibration during transit. Original moisture-proof packaging is recommended.
Certification Documents: Carry copies of marine classification certificates for customs and inspection.
Full Specification Comparison Table for Schneider C60 Series Marine Miniature Circuit Breakers
This table provides a detailed comparison of core specifications for C60N / C60H marine series (including 24338: C60N 2P C20A), covering commonly used pole counts (1P/2P/3P/4P) and current ratings (16A/20A/25A/32A/40A/50A/63A) for bulk selection.
- General Specification List (Marine C-curve)
| Model | Order Number | Poles | Rated Current | Breaking Capacity | Width | Weight | Marine Certifications | Replacement Model (iC60 Series) |
| C60N 1P C16A | M9F11116 | 1P | 16A | 10kA | 18mm | 90g | 9 Classification Societies | A9F74116 |
| C60N 1P C20A | M9F11120 | 1P | 20A | 10kA | 18mm | 90g | 9 Classification Societies | A9F74120 |
| C60N 1P C25A | M9F11125 | 1P | 25A | 10kA | 18mm | 90g | 9 Classification Societies | A9F74125 |
| C60N 1P C32A | M9F11132 | 1P | 32A | 10kA | 18mm | 90g | 9 Classification Societies | A9F74132 |
| C60N 2P C16A | M9F11216 | 2P | 16A | 10kA | 36mm | 180g | 9 Classification Societies | A9F74216 |
| C60N 2P C20A | 24338 / M9F11220 | 2P | 20A | 10kA | 36mm | 180g | 9 Classification Societies | A9F74220 |
| C60N 2P C25A | M9F11225 | 2P | 25A | 10kA | 36mm | 180g | 9 Classification Societies | A9F74225 |
| C60N 2P C32A | M9F11232 | 2P | 32A | 10kA | 36mm | 180g | 9 Classification Societies | A9F74232 |
| C60N 3P C16A | M9F11316 | 3P | 16A | 10kA | 54mm | 270g | 9 Classification Societies | A9F74316 |
| C60N 3P C20A | M9F11320 | 3P | 20A | 10kA | 54mm | 270g | 9 Classification Societies | A9F74320 |
| C60N 3P C25A | M9F11325 | 3P | 25A | 10kA | 54mm | 270g | 9 Classification Societies | A9F74325 |
| C60N 3P C32A | M9F11332 | 3P | 32A | 10kA | 54mm | 270g | 9 Classification Societies | A9F74332 |
| C60N 4P C16A | M9F11416 | 4P | 16A | 10kA | 72mm | 360g | 9 Classification Societies | A9F74416 |
| C60N 4P C20A | M9F11420 | 4P | 20A | 10kA | 72mm | 360g | 9 Classification Societies | A9F74420 |
| C60H 2P C20A | M9F14220 | 2P | 20A | 15kA | 36mm | 180g | 9 Classification Societies | A9F84220 |
| C60H 3P C20A | M9F14320 | 3P | 20A | 15kA | 54mm | 270g | 9 Classification Societies | A9F84320 |
- Comparison of Breaking Capacity & Trip Characteristics
| Series | Breaking Capacity | Trip Curve | Application Scenarios | Max Rated Current | Price Level |
| C60N | 10kA @ 400V AC | B / C / D | General ship power systems, combined lighting & motor loads | 63A | Standard |
| C60H | 15kA @ 400V AC | B / C / D | Ship systems with high short-circuit current, e.g. main switchboards | 63A | Standard +15% |
| iC60N | 15kA @ 400V AC | B / C / D | Upgraded replacement for C60N with improved performance | 63A | Standard +20% |
| iC60H | 30kA @ 400V AC | B / C / D | High-standard marine systems and offshore platforms | 63A | Standard +30% |
Trip Curve Description
B-curve: Trips at 3~5 times rated current, for pure resistive loads (lighting)
C-curve: Trips at 8~12 times rated current, for combined lighting and motor loads (most widely used)
D-curve: Trips at 12~14 times rated current, for inductive loads such as motors and transformers
- Detailed Comparison between 24338 (C60N 2P C20A) & Common Models
3.1 Same Poles, Different Current Ratings (2P)
| Model | Rated Current | Trip Current Range | Applicable Loads | Difference vs 24338 |
| C60N 2P C16A | 16A | 128~192A | Lighting & motor loads below 16A | 20% lower current, more sensitive protection |
| C60N 2P C20A (24338) | 20A | 164~200A | Combined loads below 20A | Standard configuration |
| C60N 2P C25A | 25A | 205~300A | Combined loads of 20~25A | 25% higher current, larger load capacity |
| C60N 2P C32A | 32A | 262~384A | Combined loads of 25~32A | 60% higher current, for higher-power equipment |
3.2 Same Current, Different Pole Counts (20A)
| Model | Poles | Width | Application Scenarios | Difference vs 24338 |
| C60N 1P C20A | 1P | 18mm | Single-phase lighting & socket circuits | Half width, only live pole protected |
| C60N 2P C20A (24338) | 2P | 36mm | Single-phase motors & equipment, line and neutral disconnected simultaneously | Standard configuration, comprehensive protection |
| C60N 3P C20A | 3P | 54mm | Three-phase motors & equipment, 380V systems | 50% wider, for three-phase circuits |
| C60N 4P C20A | 4P | 72mm | Three-phase four-wire systems with neutral protection | Double width, for circuits requiring neutral pole protection |
3.3 Same Specification, Different Breaking Capacity (2P 20A C)
| Model | Breaking Capacity | Application Environment | Price Difference | Difference vs 24338 |
| C60N 2P C20A (24338) | 10kA | General ship systems | Standard | Standard configuration |
| C60H 2P C20A | 15kA | Systems with high short-circuit current | 15% | 50% higher breaking capacity |
| iC60N 2P C20A | 15kA | Upgraded replacement solution | 20% | New generation product with longer service life |
| iC60H 2P C20A | 30kA | Offshore engineering platforms | 30% | 200% higher breaking capacity |
- Selection Reference Table for Marine Applications
| Load Type | Recommended Trip Curve | Recommended Breaking Capacity | Recommended Poles | Reference Current |
| Ship Lighting System | B | C60N (10kA) | 1P / 2P | 6A / 10A / 16A |
| Fans & Pump Motors | C | C60N (10kA) | 3P | 16A / 20A / 25A |
| Compressors & Air-conditioning Units | C | C60H (15kA) | 3P | 25A / 32A / 40A |
| Navigation & Communication Equipment | B | C60N (10kA) | 1P / 2P | 6A / 10A |
| Branches of Main Switchboard | C | C60H (15kA) | 3P / 4P | 32A / 40A / 50A |
| Emergency Power System | D | C60H (15kA) | 3P | 40A / 50A / 63A |
- Notes for Bulk Selection
- Marine Certifications: All C60 marine models are certified by 9 major classification societies including ABS, BV, DNV, GL, LRS, RINA, CCS and KRS, available for global use.
- Mounting Compatibility
All models adopt 35mm DIN rail mounting (compliant with EN 60715).
Width varies by pole count: 1P=18mm, 2P=36mm, 3P=54mm, 4P=72mm.
Uniform dimensions: Height 85mm, Depth 60mm.
- Replacement Strategy
Short-term replacement: Prioritize identical models from the same series (e.g. 24338 = M9F11220).
Long-term upgrade: Choose iC60N series (e.g. A9F74220 for 24338) with breaking capacity upgraded to 15kA.
Severe working conditions: Select C60H / iC60H series with 15~30kA breaking capacity.
- Environmental Adaptability
Operating temperature: -30°C ~ +60°C, suitable for extreme marine environments.
Vibration & shock resistance: Compliant with IEC 60068-2-6 and IEC 60068-2-27.
Salt-fog resistant design: Special housing material extends service life in marine conditions.
- Selection Mnemonic for C60 Marine Series
Marine C60N holds nine approvals,
Two-pole 20A with C-curve set,
iC60 upgrades breaking power,
Match poles and current for your load hour,
Wide temp and anti-vibration, ideal for marine power.
