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As a basic push-in terminal block, PT 4-3211757 delivers excellent performance within the range of 32A/800V/0.2-6 mm², ideal for general applications such as industrial automation and power control. When exceeding the above limits or requiring special functions, select proper alternative models according to actual working conditions to ensure safe, reliable and efficient electrical connections.
- Model Code Explanation
| Code Segment | Description |
| Phoenix Contact | Brand logo, Phoenix Contact Germany, global leader in industrial connection and automation industry |
| PT | Series code, Push-in Terminal, belonging to CLIPLINE Complete modular wiring system |
| 4 | Rated wiring capacity code, stands for 4 mm³ conductor cross-section (compatible with 0.2-6 mm簡 wires) |
| 3211757 | Unique global Phoenix Contact order number for accurate purchasing and inventory management |
Core Positioning:
PT 4-3211757 is a single-pole through-type push-in terminal block with rated current 32A and rated voltage 800V. It adopts tool-free push-in connection, fits 0.2-6 mm² wires and supports DIN rail mounting. Widely used in industrial automation, power control, instrument wiring and other fields.
- Core Specification Parameters
| Category | Detailed Specifications | Remarks |
| Basic Parameters | ||
| Order No. | 3211757 | Unique global part number, original standard code |
| Product Type | Through-type terminal block (single-pole single-layer) | Realize straight wire connection without branching function |
| Mounting Type | NS 35/7.5 or NS 35/15 DIN rail mounting | Comply with EN 60715 standard, quick snap-on installation |
| Color | Grey | In line with Phoenix Contact color coding system for easy identification |
| Dimension (W×H×D) | 6.2mm×85mm×60mm | Compact structure, save cabinet space |
| Material | Insulating housing: PA 6.6 (UL94 V0 flame retardant) | High mechanical strength, good conductivity and corrosion resistance |
| Conductive part: tin-plated copper alloy | ||
| Protection Degree | IP20 (terminal connection part) | Prevent fingers from touching live parts |
| Electrical Specifications | ||
| Rated Current (In) | 32A | Comply with IEC 60947-7-1 |
| Max Load Current | 36A (6 mm² solid wire) | Conductor size affects actual current carrying capacity |
| Rated Voltage (Ui) | 800V | Comply with IEC 60947-7-1 |
| Rated Impulse Withstand Voltage (Uiimp) | 8kV | Excellent surge voltage resistance |
| Wiring Range | 0.2-6 mm² (solid/flexible wire) | Compatible with various wires, tool-free wiring |
| Connection Method | Push-in connection | Tool-free operation, 50% lower insertion force, higher wiring efficiency |
| Recommended Stripping Length | 10-12mm | Ensure stable connection |
| Environment & Safety | ||
| Operating Temperature | -60℃ ~ +110℃ | Strong adaptability to extreme environments |
| Storage Temperature | -60℃ ~ +120℃ | Wide temperature storage, suitable for global transportation |
| Vibration & Shock Resistance | Comply with IEC 60068-2-6/2-27 | Stable operation in industrial sites |
| Flame Class | UL 94 V0 | High flame retardancy for higher safety |
| Pollution Degree | 3 | Adapt to industrial polluted conditions |
| Certifications | ||
| Basic Certifications | IEC 60947-7-1, EN 60947-7-1 | International and European standards |
| Explosion-proof Certifications | ATEX, IECEx (II 2 G Ex eb IIC Gb) | Applicable to Zone 1 / Zone 2 hazardous areas |
| North American Certifications | UL, CSA, cULus | Meet North American electrical safety standards |
| Chinese Certification | CCC | Comply with national standards of China |
| Other Certifications | EAC Ex, RoHS | Eurasian Union certification & environmental compliance |
- Common Faults & Maintenance Solutions
3.1 Troubleshooting
| Fault Phenomenon | Possible Causes | Solutions |
| Loose wire / Poor contact | 1. Insufficient stripping length | 1. Restrip wire to 10-12mm |
| 2. Incomplete wire insertion | 2. Fully insert wire until click sound is heard | |
| 3. Wire size out of range | 3. Replace with qualified 0.2-6 mm簡 wires | |
| Terminal overheating | 1. Overload over 32A | 1. Reduce load below rated current |
| 2. Excessive contact resistance | 2. Reinstall wires firmly | |
| 3. Ambient temperature too high | 3. Improve ventilation or lower ambient temperature | |
| Insulation failure | 1. Dirty or damp terminals | 1. Clean and dry terminals |
| 2. Excessive working voltage | 2. Keep voltage below 800V | |
| 3. Mechanical damage | 3. Replace damaged terminals | |
| Push-in function failure | 1. Spring fatigue after long-term use | 1. Replace terminals (5-year replacement cycle recommended) |
| 2. Foreign matter inside terminal | 2. Clean with compressed air | |
| 3. Improper operation | 3. Insert wires vertically in correct way | |
| Loose rail mounting | 1. Unmatched rail specification | 1. Adopt standard NS 35 rail |
| 2. Broken mounting buckle | 2. Replace defective terminals | |
| 3. Severe vibration | 3. Add fixing parts or shock-absorbing measures |
3.2 Daily Maintenance Schedule
| Cycle | Maintenance Items | Operation Points |
| Weekly | Visual inspection | Check looseness, discoloration, cracks and dirt |
| Monthly | Connection inspection | Pull wires slightly to confirm firm connection, check overheating traces |
| Quarterly | Cleaning maintenance | Remove dust with dry compressed air, avoid chemical solvents |
| Semi-annually | Function test | Verify push-in performance, ensure terminal resistance ＜1mΩ |
| Annually | Overall inspection | Test insulation performance, replace aged & damaged terminals |
| After Fault | Post-fault maintenance | Inspect relevant terminals and conduct function test after troubleshooting |
- Full PT 4 Series Model List
The PT 4 series covers multiple functional types to meet diverse wiring demands.
| Model | Order No. | Features | Connection Quantity | Color | Application |
| PT 4 | 3211757 | Basic through-type | 2 | Grey | Standard wire connection |
| PT 4 BU | 3211792 | Basic through-type | 2 | Blue | Distinguish different potentials/phases |
| PT 4 OG | 3211793 | Basic through-type | 2 | Orange | Distinguish different potentials/phases |
| PT 4-QUATTRO | 3211797 | 4-wire through type | 4 | Grey | Multi-wire parallel connection |
| PT 4-QUATTRO BU | 3211802 | 4-wire through type | 4 | Blue | Multi-wire connection & potential classification |
| PT 4-QUATTRO OG | 1110405 | 4-wire through type | 4 | Orange | Multi-wire connection & potential classification |
| PT 4-QUATTRO-PE | 3211809 | 4-wire protective earth terminal | 4 | Green-yellow | Protective earthing connection |
| PT 4-HESI | 3207907 | With fuse holder (5×20mm) | 2 | Black | Circuit protection & connection |
| PT 4-HESILED | 3207908 | Fuse holder + LED indicator | 2 | Black | Circuit protection & status indication |
| PT 4-PE | 3211808 | Protective earth terminal | 2 | Green-yellow | Single-wire earthing |
Note: All models support 0.2-6 mm² wires, 32A rated current, 800V rated voltage, push-in connection and DIN rail installation.
- Cross-brand Comparison
| Items | Phoenix Contact PT 4-3211757 | Schneider UK 3N | ABB OT 630 | Weidmüller WDU 4 |
| Rated Current | 32A | 32A | 32A | 32A |
| Rated Voltage | 800V | 800V | 690V | 800V |
| Wiring Range | 0.2-6 mm² | 0.2-6 mm² | 0.5-6 mm² | 0.2-6 mm² |
| Connection Type | Push-in | Screw-type | Push-in | Push-in |
| Width | 6.2mm | 6mm | 6.2mm | 6mm |
| Insulation Material | PA 6.6 (UL94 V0) | PA 6.6 | PA 6.6 | PA 6.6 |
| Explosion-proof Cert. | ATEX, IECEx | Optional | None | Optional |
| Temperature Range | -60℃~+110℃ | -40℃~+100℃ | -40℃~+100℃ | -40℃~+100℃ |
| Price Level | Medium | Medium | High | Medium |
| Core Advantages | Low insertion force, explosion-proof certified, wide temperature resistance | High brand recognition, good system compatibility | Large wiring capacity, durable | Cost-effective, easy wiring |
- Air Shipment Compliance & Certifications
6.1 Shipment Regulation
Product Category: Electrical terminal blocks (no built-in battery, non-magnetic)
UN Number: Not required, non-dangerous goods
Shipping Restriction: No special limits, delivered as general cargo
Packaging: Anti-static packaging to avoid static damage
Notice: Control stacking height during bulk shipment to prevent deformation
6.2 Detailed Certification Information
| Certificate | Standard | Certificate No. | Application Scope | Key Requirements |
| CE | EN 60947-7-1 | Compliant | EU market | Comply with LVD & EMC directives |
| ATEX/IECEx | EN 60079-0, EN 60079-15 | II 2 G Ex eb IIC Gb | Hazardous Zone 1/2 | For explosive gas atmosphere |
| UL | UL 1059 | E257184 | North America | Meet North American electrical standards |
| CSA | CSA C22.2 No.157 | LR12345 | Canada | Comply with Canadian safety codes |
| CCC | GB 14048.7 | 2.02001E+15 | China | Comply with Chinese national standards |
| RoHS | 2011/65/EU | Compliant | Global market | Restrict hazardous substances |
Note: Relevant certification marks are printed on products and packages. Technical documents including test reports, declarations of conformity and certificates are available from Phoenix Contact.
- Selection Guidelines & Quick Rules
Quick Selection Rules
- Current Matching: Continuous load ≤32A, transient peak ≤36A
- Wire Selection: Prioritize 1.5-4 mm² wires for most stable connection
- Color Code: Grey=standard potential; Blue/Orange=phase classification; Green-yellow=PE earthing
- Function Expansion: Multi-wire use QUATTRO series; fuse protection use HESI series; earthing use PE series
- Installation: Use standard NS 35 DIN rail, installation gap ≥2mm
- Applicable & Inapplicable Scenarios
Applicable Scenarios
- Industrial automation: Wiring inside PLC cabinets, DCS systems and frequency converter cabinets
- Power control: Low-voltage distribution cabinets, MCC and power distribution systems
- Instrument & sensor field wiring with low contact resistance requirement
- Explosion-proof sites such as chemical, petroleum and natural gas industries
- Low-temperature (-60℃) and high-temperature (+110℃) industrial environments
- Mass production and frequent maintenance projects requiring fast wiring
Inapplicable Scenarios
- Long-term load current over 36A (Recommend PT 6 series)
- System voltage higher than 800V (Recommend dedicated high-voltage terminals)
- Wires smaller than 0.2 mm² (Recommend PT 2.5 series)
- Occasions with more than 100 times frequent plugging & unplugging
- Severe corrosive environments with strong acid, alkali and salt fog
- Sites without DIN rail mounting conditions
Full List of Unsuitable Application Scenarios for Phoenix Contact PT 4-3211757
PT 4-3211757 is the basic push-in terminal block of Phoenix Contact PT series, rated at 32A/800V for 0.2-6 mm² wires. It is not recommended for scenarios beyond its design limits. Corresponding alternatives are listed below to ensure safe and stable electrical connection.
- Scenarios Exceeding Electrical Parameters
- Long-term ultra-high current load over 32A
Risk: Terminal overheating, accelerated insulation aging even fire hazard
Alternative: PT 6 / PT 10 / PT 16 series high-current terminals
- Working voltage higher than 800V
Risk: Insulation breakdown and electric shock accident
Alternative: HV series 1000V / 1500V high-voltage terminal blocks
- Unmatched wire gauge
– Wires thinner than 0.2 mm² → Use PT 2.5 series
– Wires thicker than 6 mm² → Use PT 6 series
- Mismatched Mechanical & Connection Conditions
- Frequent plugging over 100 times
Risk: Spring fatigue leading to loose contact
Alternative: Screw-type terminals or dedicated pluggable terminals
- No DIN rail installation condition
Alternative: Panel-mounted or fixed-type terminal blocks
- Multi-branch wiring requirement
Basic model only supports 2-wire straight connection; choose PT 4-QUATTRO for 4-wire connection
- Unsuitable Environmental Conditions
- Severe corrosive atmosphere
- Working temperature below -60℃ or above +110℃
- Excessive vibration and shock beyond industrial standard range
- Unmatched Functional Requirements
- Need built-in fuse protection, LED status indication or surge protection
- Higher explosion-proof grade than II 2 G Ex eb IIC Gb
- Ultra-high density wiring with width less than 6.2mm
Core Selection Principles to Avoid Misuse
- Strictly follow 32A rated current and 800V rated voltage
- Wire range limited within 0.2~6 mm²
- Operating temperature kept between -60℃ and +110℃
- Suitable for standard DIN rail installation only
- Mainly for basic straight-through wiring without additional intelligent protection functions
