Technical Specifications: Genuine VOLVO Control Relay Module 21311705Genuine VOLVO Control Relay Module — Electromagnetic Power Switching Solution
The Genuine VOLVO Premium Heavy‑Duty Control Relay Module (Part Numbers: 21311705 / VOE 21311705), also called Electromagnetic Power Switching Unit, is a core circuit‑control component for VOLVO D‑series and E‑series excavators. Installed in central fuse box (14683137), it uses low‑current signals from switches (14502722) or V‑ECU (11381435) to control high‑power devices such as preheaters, blowers, starters and work lights. Replacing worn relays eliminates power failure and protects ECU from voltage spikes.
Core Technical Advantages
Silver‑Nickel Contacts: High‑purity AgNi contacts resist arc erosion and welding over millions of switching cycles.
Flame‑Retardant Housing: Heat‑resistant composite shell ensures stable performance under high cabin temperatures.
Vibration‑Proof Coil: Reinforced copper coil resists heavy‑duty digging vibration and contact chatter.
Anti‑Oxidation Blade Terminals: OEM‑spec plug‑in pins ensure tight low‑resistance connection in fuse boxes.
Technical Specifications
| Engineering Parameter | Technical Data / Specification Details |
|---|
| Component Assembly Part Number | 21311705 / VOE 21311705 |
| Component Classification | Heavy‑Duty Electromagnetic Control Relay / Power Switching Node |
| Operating Voltage | 24V DC Heavy Machinery Electrical System |
| Contact Material | Arc‑Resistant Silver‑Nickel (AgNi) Alloy |
| Mounting Type | Multi‑Pin Plug‑In Interlocking Terminal Base |
| Protection Grade | Dust‑Sealed Internal Structure |
Master Application Fleet Guide
This 24V relay fits VOLVO D‑series and E‑series construction excavators:
Compact Excavators: EC140D/E, EC160D/E, EC180D/E
Mid‑Size Excavators: EC200E, EC220D/E, EC250D/E, EC300D/E, EC350D
Critical B2B Procurement & Maintenance Guidelines
B2B Procurement Strategy
Relays suffer from arc erosion and spring fatigue; failure may disable starters or ECU power. Stock 21311705 for routine maintenance and emergency repairs. Cross‑sell with fuse box (14683137) and wiring harness (14597767) for complete electrical system upgrade.
Common Failure Symptoms
Complete accessory power failure caused by broken internal coil
Continuous battery drain from permanently welded closed contacts
Intermittent flickering accessories and voltage fault codes under vibration
Best Practice Overhaul Advisory:
Disconnect main battery before replacement to avoid voltage spikes damaging ECU or display modules. Clean fuse box terminals with contact cleaner, insert new relay firmly until fully locked.
Global Brand Cross‑Reference Matrix
| Brand | Cross‑Reference Part Numbers |
|---|
| VOLVO Genuine PN | 21311705 / VOE 21311705 |
| Component Group | Main Power Distribution Relay / Electromagnetic Switching Core / 24V DC Auxiliary Controller |
Commercial Inquiry & Global Logistics:Supplier: Xuzhou Sinoswift Import & Export Co., Ltd.
Contact: +86 13701956981
Email:
[email protected]Logistics: Global Sea Freight and Fast‑Track Industrial Express Ready
All manufacturer names and model designations are for compatibility reference only. These genuine control relays provide reliable power switching for global VOLVO construction, quarry and mining machinery fleets.
