Siemens 3SB3400-0C Screw Terminal Contact Block

3SB3400-0C: SIRIUS 3SB3 series, แผงด้านหน้า mounted single contact block, 1เอ็นซี (1 ปกติปิด), screw terminal type. Designed for 22mm pushbuttons / สวิตช์เลือก, Positive Opening safety contact.

สถานะสินค้า: ยกเลิก (PM490). Original manufacturer supply stopped. Recommended replacement model: 3SU1400-1AA10-1CA0 (SIRIUS ACT series)

ข้อมูลทางเทคนิคหลัก

การคัดเลือก & Matching Guidelines

1. Cross reference of contact blocks in the same series

3SB3400-0B: 1เลขที่ (Single Normally Open)

3SB3400-0C: 1เอ็นซี (เดี่ยวปกติปิด, รุ่นนี้)

3SB3400-0A: 1NO+1NC (1 Changeover)

3SB3400-0D: 2เลขที่; 3SB3400-0E: 2เอ็นซี

2. Stacking Rule: One contact block occupies one mounting slot; สูงสุด. 3 contact blocks for non-illuminated pushbuttons
3. Positive Opening Feature: This NC contact is a safety contact, suitable for E-Stop circuits and meets positive opening requirements for safety loops. Priority selection for emergency stop applications.

สถานการณ์การใช้งาน

22mm pushbuttons, rotary switches and emergency stop signal collection in control cabinets

บมจ digital input circuits, safety E-Stop loops, interlock circuits

Guard interlocks, equipment limit detection, fault alarm signals

คู่มือการแก้ไขปัญหา

1. Low-level signal (5V/1mA): Contact oxidation shall be checked first. Although low-level reliability is specified, aged contacts may suffer poor contact.
2. วงจรความปลอดภัย: Positive opening NC contact must be used. Ordinary contacts are prohibited as substitutes. During maintenance, manually actuate pushbutton and verify reliable contact opening.
3. สายไฟ: Control tightening torque of screw terminals; loose connections cause signal jitter. เทอร์มินัล IP20, metal dust prevention required inside cabinet terminal area.

Replacement Model Description

ทดแทน OEM โดยตรง: 3SU1400-1AA10-1CA0 (SIRIUS ACT,1เอ็นซี, ขั้วต่อสกรู, เปิดเชิงบวก, 22mm pushbutton system).

Bases of old & new series cannot be interchanged. Full assembly replacement (ตัวกระตุ้น + ฐาน + ผู้ติดต่อ) is required when switching to 3SU1.

1. 3SB3 Pushbutton Assembly Selection Examples (Based on 3SB3400-0C 1NC Contact Block)

Core rule: 3SB3 adopts modular assembly: แอคชูเอเตอร์ + Base Holder + Contact Block. สูงสุด. 3 contact blocks for non-illuminated pushbuttons; max.2 contact blocks for illuminated pushbuttons. Each contact block occupies one mounting slot.

Contact block list recap

3SB3400-0B:1เลขที่

3SB3400-0C:1เอ็นซี (รุ่นนี้, positive opening safety contact)

3SB3400-0A:1NO+1NC

3SB3400-0D:2เลขที่; 3SB3400-0E:2เอ็นซี

Example1: Mushroom Head Emergency Stop (วงจรความปลอดภัย, Most Common for 3SB3400-0C)

วัตถุประสงค์: Equipment emergency stop, safety circuit positive opening NC

แอคชูเอเตอร์:3SB3000-1HA20 (Red mushroom head, twist reset)

Base holder:3SB3901-0AC (3-position holder)

ติดต่อ: 3SB3400-0C (1NC positive opening)

Complete factory pre-assembled part number:3SB3203-1HA20-0AC0 (factory pre-fitted with 1NC, no separate contact ordering required). Redundant safety circuit can add a second 3SB3400-0C for dual NC.

Example2: Red Momentary Pushbutton (Fault Acknowledge)

วัตถุประสงค์:รีเซ็ตข้อผิดพลาด, PLC DI acquisition

แอคชูเอเตอร์:3SB3000-0AA21 (Red flat momentary button)

Holder:3SB3901-0AC (3-position holder)

ติดต่อรวมกัน:3SB3400-0B (1เลขที่) + 3SB3400-0C (1เอ็นซี)

การทำงาน:NO for DI signal; NC for circuit fault verification

Example3: 2-position Selector Switch (0-ฉัน)

วัตถุประสงค์:Local/Remote mode switchover

Switch actuator:3SB3000-2CA11 (2-position latching selector switch)

Holder:3SB3901-0AC

ติดต่อ:3SB3400-0B (NO for I position) + 3SB3400-0C (NC for 0 ตำแหน่ง)

Example4: Illuminated Green Start Pushbutton

ข้อจำกัด: Max.2 contact blocks for illuminated pushbuttons

แอคชูเอเตอร์:3SB3000-4AA31 (Green illuminated flat pushbutton)

Lamp holder:3SB3401-1A (LED lamp holder)

ติดต่อ:3SB3400-0B (1NO for start) + 3SB3400-0C (1NC for interlock)

1. Replacement List from Old 3SB3 to New SIRIUS ACT 3SU1

⚠️Important: 3SB3 and 3SU1 bases/contact blocks are completely non-interchangeable. Contacts cannot be replaced alone; full assembly replacement (ตัวกระตุ้น + ฐาน + ผู้ติดต่อ) is mandatory.

Original contact block 3SB3400-0C (1NC screw terminal, เปิดเชิงบวก)

→ Corresponding contact: 3SU1400-1AA10-1CA0 (1เอ็นซี, ขั้วต่อสกรู, เปิดเชิงบวก)

III. การประกอบ & Engineering Guidelines

1. Contact stacking sequence: Mount safety NC contact (3SB3400-0C) closest to panel side for best mechanical synchronization. Recommended for emergency stop safety circuits.
2. แรงบิด: Screw terminal tightening torque 0.8~1.2 N·m. Loose connections lead to DI signal fluctuation; loose terminals strictly prohibited for safety circuits.
3. Low-level signal: PLC passive DI (5V/1mA). Use OEM contacts preferably. Aged contacts tend to oxidize, NC circuits more prone to intermittent conduction.
4. Panel cutout: Standard Φ22mm round hole; round 3SB3 panel thickness: 1~6 มม; square 3SB3 panel thickness: 1～4 mm.
5. Migration Notes During Model Replacement
6. Cabinet cutout unchanged, both Φ22mm, but front bezel profile differs. Deburr if old cutout edge corroded.
7. Terminal position changes after replacement, redraw terminal diagram to avoid wiring misconnection.
8. วงจรความปลอดภัย: New 3SU1 1NC contact also features positive opening, สอดคล้องกับ EN 60947-5-1 and can directly replace original 3SB3400-0C for emergency stop applications.
9. Spare part strategy: 3SB3 series discontinued by OEM, only stock parts available on market. New projects adopt 3SU1 directly.

ซีเมนส์ 3SB3400-0C Mounting Dimensions

This model is a single contact block (1เอ็นซี) belonging to 3SB3 series modular 22mm pushbutton components. The contact block has no separate cutout, clipped onto 3SB3 holder (3SB3901-0AC). Complete pushbutton panel cutout Φ22mm.

Contact Block Physical Dimensions (มม)

ความกว้าง: 10 มม (standard width of single contact block, each block occupies 10mm during stacking)

ความสูง: 36.5 มม

ความลึก: 20 มม (from holder surface backward including screw terminals)

Single contact blocks (3SB3400-0B / 0ค) share identical dimensions. Double contact blocks (3SB3400-0A/0D/0E) width =20mm.

Complete Pushbutton Assembly Dimensions (Holder + Contact Blocks)

1. แผงคัตเอาท์: Φ22 มม (standard 22mm pushbutton round hole)

Round pushbutton panel thickness: 1~6 มม

Square pushbutton panel thickness: 1～4 mm

2. 3-position holder 3SB3901-0AC: สูงสุด. 3 single contact blocks stacked, total stacking width=3×10=30 mm
3. Cabinet rear depth:

1 contact block: ~42 mm (panel rear face to terminal end)

Fully loaded with 3 contact blocks: ~42 mm (ความลึกไม่เปลี่ยนแปลง, only lateral width increases)

Mounting Spacing Requirements

Center-to-center minimum distance between adjacent 22mm pushbuttons: 50มม (round type); นาที. 50mm for square 3SB3 pushbuttons

Reserved rear cabinet space: ≥45mm for wiring and terminal tightening

Dimension Comparison with Replacement Model 3SU1400-1AA10-1CA0 (3SU1 Contact Block)

Body dimension: W10mm × H36.5mm × D20mm, similar body size

⚠️Holder structure differs and cannot be directly interchanged. Panel cutout still Φ22mm but rear mounting profile is different.

Engineering Drawing Notes

1. Contact block is clip-on type, no fixing screws; slide and clip into holder rail.
2. Terminal screws protrude rearward. Reserve ≥45mm depth for cabinet layout.
3. Stacking sequence: Mount safety NC contact (3SB3400-0C) nearest to panel.